**The Challenges of Bending Pipes: A Reality Check**

I can attest that bending pipes is hard, believe me, I try it all the time. It's indeed easier to connect small segments than it is to shape one long pipe to fit every contour of a car. Additionally, you can replace components when they wear out instead of replacing the whole system. One of the byproducts produced is an acidic moisture that's really damaging to the metal, so pieces of the system only last so long even when they're well maintained.

**The Benefits of Aftermarket Exhaust Systems**

Aftermarket exhaust systems are super popular, and a good one can improve throttle response, give a boost in horsepower, and even improve fuel economy. Performance exhausts are less restrictive than stock, allowing the engine to push out more air, which means it can pull in more oxygen and help the engine make more power.

**The Importance of Back Pressure**

Contrary to what you might think, a free-flowing system is not always better. Some people claim that a certain amount of back pressure is beneficial, but they're probably mixing up back pressure and scavenging. Scavenging is the phenomenon where the movement of gases through the exhaust system creates a partial vacuum that can actually suck the exhaust out of the cylinder.

**The Role of Exhaust Design**

In a properly designed exhaust system, you're helping to pull the air through the engine by maximizing the scavenging effect around a wide range of rpms. If the pipes are too big or too restrictive, you lose the effect, and the engine has more trouble pushing the air out.

**The Ultimate Low Restriction Exhaust System**

A top fuel dragster's exhaust system is a great example of an ultimate low restriction exhaust system. Each cylinder gets its own exhaust pipe, which is only about three feet long, serving to get the exhaust up and away from the engine while using the force of the exhaust to create a little extra downforce.

**Conclusion**

Talking about all this exhaust can be exhausting, but I hope you guys were able to intake that information. Thanks to Fixed for sponsoring this episode! Fixed is a Bluetooth OBD2 reader that links up with your phone. Click the link in the description to get 10% off with the code Donut. Remember that Fixed has a mechanic hotline and offers enhanced error code detection, allowing you to be more competitive with those high-end scan tools. Go to fixsteps.com and use the code Donut at checkout.

**Subscribe to Donut**

Don't forget to subscribe to Donut! Click on the little buttons to subscribe so you never miss a new episode. We've got new stuff coming out almost every day of the week. Check out this episode of Wheelhouse, it's really good, and Terra's episode of Hot Lap is cool too!

**Follow Us**

Follow us on Twitter and Instagram at @Donut, and follow me at @BidSBardot. Don't tell my wife that resonator didn't come with the car!

WEBVTTKind: captionsLanguage: enexhaust and intake hey gang I am super excited because this week I get to talk about one of my favorite things in the whole world no not reverse werewolves I get to talk about your car's butthole the exhaust I also get to talk about your car's front butt hole that's sucks air instead of pushing it out the intake so basically we're gonna go over how air and gases flow through your car oh oh did I just say flow somebody dropped the beat cuz I'm about to bust a flow myself here I go oh no I lost it I'm sorry if you want to hear my sick freestyles you're gonna have to check out my mixtape on soundcloud the Barton of rap yeah I'm a soundcloud rapper every time we film one of these I spent 14 hours in makeup to cover up all my face tattoos alright now let's take a look at your cards reverse front but its intake then take is how your car inhales it takes in the oxygen it needs some people might say it's like your car's nose or lungs but those people are crazy we've talked about how the engines like an air pump and the more air it can move more power it can get to the wheels leaders cubic centimeters and cubic inches are all measures of engine displacement one way to think of it is how much air can get into and get pushed out of the cylinders the intake manifold is a series of tubes that distributes their coming into the engine evenly to each of the cylinders so that the right amount of air can mix with the right amount of gas in a 4-stroke process during the first stroke or the intake stroke air from the intake manifold is sucked into each cylinder the intake valves are then closed for the other three strokes compression combustion and exhaust they reopen the cycle starts all over again the intake manifold makes sure that there's enough air available when the valve opens for each intake stroke and that each cylinder gets the same amount of air as the air it applies the manifold from the hair cleaner assembly which contains the air filter now a lot of people write in to ask me if they really need to change their air filter in fact it's one of the questions I'm most asked anyway moving on you might have heard a lot of stuff about cold air intakes being an easy way to get horsepower well let's think about that for a second cold air intakes move the air filter outside of the engine compartment so that cooler air can be sucked in the engine for combustion cooler air is more dense and that means more oxygen into the combustion chamber and that means more boom the filters are usually moved to the upper wheel well area or near a fender where there's more access to free-flowing cooler air and less hot air from the engine they also increase air flow by removing the need for a box surrounding the air filter instead they use large diameter intake tubes that are smoother have fewer bends and they're often wider than the factory ones removing the air box and uses these bigger smoother tube helps create an uninterrupted airflow these types of high capacity swaps on their own don't really do much cuz an engine is an engine but if you got a blower or a car that you tuned or board to get more power than a High Flow Intake is absolutely necessary to get the most out of it there is a drawback to putting the air filter in different places like low behind the wheels where a lot of new cars have sure you get cool air away from the engine let's say there's a flood then it pulls water in and it wrecks your engine and that's why you see so many cars stuck in puddles on the news it's also why off-road money vehicles got those periscope e type of things sticking up that's their intake if you're worried your engine's not getting all the air that it should your car can let you know this fixed obd2 reader and app can measure air flow into the engine in real time it gives you live data so you can optimize that intake if you're not sure if you're doing right they got videos and blog posts that explain issues and give you the next steps to getting your car running the way you want if that's not enough they just launched fixed mechanic hotline provides unlimited access to an ASE certified mechanic for anything you need and once the air goes through the engine we gotta get rid of it as I said early the exhaust is like a cars but your car produces some harmful gases but they go through your exhaust system and get cleaned up go out your tailpipe just like how your body produces harmful gases and then your butt cleans them before you go out of your butthole also I really don't know how the human body works I just figured out what these things are the other day everybody hands make it be used for all sorts of jobs no engine runs completely efficiently as it combust fuel there's gonna be leftover dirty bits that exit as polluted ropes some amount of fuels it's gonna be unburdened partially burned and that's got to be quickly processed out of a meal through the exhaust to make room for the next cycle of combustion the exhaust first exits the engine and enters the system through the exhaust manifold or exhaust header it collects the exhaust directly from the engine each opening mates up with one of the engines exhaust port with flanges that form a tight seal to prevent it from escaping also the gaskets that are fitted between each pipe they're super important it's tough to form a flawless metal to metal seal so the gaskets are sandwiched between each connection to prevent the gases from escaping the exhaust then travels down the system through interconnected pipes until it exits through the tailpipe near the back bumper pipes help cool off the exhaust but they're mostly away for the exhaust to travel to and through the catalytic converter and muffler that's gonna burn off remove up to 90% of the exhaust toxins and it's designed to have as little impact on the flow of air as possible the muffler and resonator usually situated right after the cab the muffler looks like a big round or oval chamber and it's responsible for silencing most of the engines noise it also has to allow the exhaust to continue flowing smoothly that's a double duty it's got to let the air flow while stopping the sound ways it breaks the sound ways up by making them crash into each other it's got all these chambers hey let's all be really quiet take Wow that's really some the resonator is a secondary or a substitute sound elimination component in some cases it can be used instead of a muffler there's different combinations of these some soothe the exhaust as much as possible and others are specifically tuned for loud and aggressive tones you know we do a whole episode on resonators there's a buttload of pipes in the exhaust system each designed to connect to one another and shaped to conform to a specific part of the underside of the car they're made like this because bending pipes is hard believe me I try it all the time it's easier to connect small segments than it is to shape one long pipe to fit every contour of a car also you can replace components when they wear out instead of replacing the whole system one of the byproducts produced is an acidic moisture that's really damaging to the metal so pieces of the system only last so long even when they're well maintained it's it's hard to keep the inside of the pipes clean probiotics and fiber can help some I switch to talking about my butt for a second aftermarket exhaust systems are super popular a good one can improve throttle response give a boost in horsepower and even can improve fuel economy performance exhausts are less restrictive than stock the engine can push out more air it also means it can pull in warrior and that helps the engine make more power but contrary to what you might think a free-flowing system is not always better I've heard a few conspiracy theories out there that go all the way from the Vatican down to do do Donuts let's say you need back pressure for an engine to work that is not exactly true back pressure is naturally created at various points because of the nature of the exhaust design but it's never desirable runners for each cylinder meet in the collector basically a rapid expansion and a pipe diameter from a single pipe when a cylinder exhaust pulse hits the collector a refraction low-density pressure waves form and that travels upstream back to the exhaust valves and decreases pressure at the valve depending on the length of the runners peak performance shifts to differ in our PM you can also use the cylinder pulses from the other cylinders to help each other out and improve your scavenging performance so why would back pressure be seen as helping basically when people claim that a certain amount of back pressure is beneficial they're probably mixing up back pressure and scavenging that phenomenon where the movement of gasses through the exhaust system creates a partial vacuum that can actually suck the exhaust out of the cylinder think of siphoning gas don't do it just think of it all right the pool of the gas in the front draws more gas from the back in a perfectly designed exhaust you're helping to pull the air through the engine if the pipes too big you lose the effect if it's too restrictive the engines got more trouble pushing the air out a properly designed exhaust system maximizes this scavenging effect around a wide range of rpms a lot of times people who put a massive diameter exhauster header they'll see a drop in power because they've dropped the exhaust velocity significantly and as a result they lost some of the strength of the inertial effects of the exhaust because it's slower Gaspee oh hey let's check out the ultimate low restriction exhaust system a top fuel dragster each cylinder gets its own exhaust pipe which at roughly three feet long only serves to get the exhaust up and away from the engine in the process using the force of the exhaust to create a little extra downforce to lose traction oh man talking about all this exhaust sure is exhausting I am exhausted probably doesn't help that I always demand exhaust be pumped into the studio when we filmed hope you guys were all able to intake that information all Sacajawea home boys subscribe to donut thanks to fixed for sponsoring the episode fixed is a Bluetooth obd2 reader that links up with your phone you can click the link in the description to get 10% off with the code donut remember that fixed mechanic hotline they're often donut viewers a 10% discount that service to the fix is new proved they've got enhanced errorcode detection being able to detect manufacturer specific codes so you can be more competitive with those high-end scan tools and it does deeper diagnostics than used to so go to fix step calm and use the code donut at the checkout subscribe to donut there's little buttons to subscribe click on it so you never miss a new episode we got new stuff coming out almost every day of the week check out this episode of wheelhouse cuz it's really good Terra's episode of hot lap it's cool follow us on Twitter and Instagram at Dona Mia follow me at bids Bardot don't tell my wife that resonator didn't come with the carexhaust and intake hey gang I am super excited because this week I get to talk about one of my favorite things in the whole world no not reverse werewolves I get to talk about your car's butthole the exhaust I also get to talk about your car's front butt hole that's sucks air instead of pushing it out the intake so basically we're gonna go over how air and gases flow through your car oh oh did I just say flow somebody dropped the beat cuz I'm about to bust a flow myself here I go oh no I lost it I'm sorry if you want to hear my sick freestyles you're gonna have to check out my mixtape on soundcloud the Barton of rap yeah I'm a soundcloud rapper every time we film one of these I spent 14 hours in makeup to cover up all my face tattoos alright now let's take a look at your cards reverse front but its intake then take is how your car inhales it takes in the oxygen it needs some people might say it's like your car's nose or lungs but those people are crazy we've talked about how the engines like an air pump and the more air it can move more power it can get to the wheels leaders cubic centimeters and cubic inches are all measures of engine displacement one way to think of it is how much air can get into and get pushed out of the cylinders the intake manifold is a series of tubes that distributes their coming into the engine evenly to each of the cylinders so that the right amount of air can mix with the right amount of gas in a 4-stroke process during the first stroke or the intake stroke air from the intake manifold is sucked into each cylinder the intake valves are then closed for the other three strokes compression combustion and exhaust they reopen the cycle starts all over again the intake manifold makes sure that there's enough air available when the valve opens for each intake stroke and that each cylinder gets the same amount of air as the air it applies the manifold from the hair cleaner assembly which contains the air filter now a lot of people write in to ask me if they really need to change their air filter in fact it's one of the questions I'm most asked anyway moving on you might have heard a lot of stuff about cold air intakes being an easy way to get horsepower well let's think about that for a second cold air intakes move the air filter outside of the engine compartment so that cooler air can be sucked in the engine for combustion cooler air is more dense and that means more oxygen into the combustion chamber and that means more boom the filters are usually moved to the upper wheel well area or near a fender where there's more access to free-flowing cooler air and less hot air from the engine they also increase air flow by removing the need for a box surrounding the air filter instead they use large diameter intake tubes that are smoother have fewer bends and they're often wider than the factory ones removing the air box and uses these bigger smoother tube helps create an uninterrupted airflow these types of high capacity swaps on their own don't really do much cuz an engine is an engine but if you got a blower or a car that you tuned or board to get more power than a High Flow Intake is absolutely necessary to get the most out of it there is a drawback to putting the air filter in different places like low behind the wheels where a lot of new cars have sure you get cool air away from the engine let's say there's a flood then it pulls water in and it wrecks your engine and that's why you see so many cars stuck in puddles on the news it's also why off-road money vehicles got those periscope e type of things sticking up that's their intake if you're worried your engine's not getting all the air that it should your car can let you know this fixed obd2 reader and app can measure air flow into the engine in real time it gives you live data so you can optimize that intake if you're not sure if you're doing right they got videos and blog posts that explain issues and give you the next steps to getting your car running the way you want if that's not enough they just launched fixed mechanic hotline provides unlimited access to an ASE certified mechanic for anything you need and once the air goes through the engine we gotta get rid of it as I said early the exhaust is like a cars but your car produces some harmful gases but they go through your exhaust system and get cleaned up go out your tailpipe just like how your body produces harmful gases and then your butt cleans them before you go out of your butthole also I really don't know how the human body works I just figured out what these things are the other day everybody hands make it be used for all sorts of jobs no engine runs completely efficiently as it combust fuel there's gonna be leftover dirty bits that exit as polluted ropes some amount of fuels it's gonna be unburdened partially burned and that's got to be quickly processed out of a meal through the exhaust to make room for the next cycle of combustion the exhaust first exits the engine and enters the system through the exhaust manifold or exhaust header it collects the exhaust directly from the engine each opening mates up with one of the engines exhaust port with flanges that form a tight seal to prevent it from escaping also the gaskets that are fitted between each pipe they're super important it's tough to form a flawless metal to metal seal so the gaskets are sandwiched between each connection to prevent the gases from escaping the exhaust then travels down the system through interconnected pipes until it exits through the tailpipe near the back bumper pipes help cool off the exhaust but they're mostly away for the exhaust to travel to and through the catalytic converter and muffler that's gonna burn off remove up to 90% of the exhaust toxins and it's designed to have as little impact on the flow of air as possible the muffler and resonator usually situated right after the cab the muffler looks like a big round or oval chamber and it's responsible for silencing most of the engines noise it also has to allow the exhaust to continue flowing smoothly that's a double duty it's got to let the air flow while stopping the sound ways it breaks the sound ways up by making them crash into each other it's got all these chambers hey let's all be really quiet take Wow that's really some the resonator is a secondary or a substitute sound elimination component in some cases it can be used instead of a muffler there's different combinations of these some soothe the exhaust as much as possible and others are specifically tuned for loud and aggressive tones you know we do a whole episode on resonators there's a buttload of pipes in the exhaust system each designed to connect to one another and shaped to conform to a specific part of the underside of the car they're made like this because bending pipes is hard believe me I try it all the time it's easier to connect small segments than it is to shape one long pipe to fit every contour of a car also you can replace components when they wear out instead of replacing the whole system one of the byproducts produced is an acidic moisture that's really damaging to the metal so pieces of the system only last so long even when they're well maintained it's it's hard to keep the inside of the pipes clean probiotics and fiber can help some I switch to talking about my butt for a second aftermarket exhaust systems are super popular a good one can improve throttle response give a boost in horsepower and even can improve fuel economy performance exhausts are less restrictive than stock the engine can push out more air it also means it can pull in warrior and that helps the engine make more power but contrary to what you might think a free-flowing system is not always better I've heard a few conspiracy theories out there that go all the way from the Vatican down to do do Donuts let's say you need back pressure for an engine to work that is not exactly true back pressure is naturally created at various points because of the nature of the exhaust design but it's never desirable runners for each cylinder meet in the collector basically a rapid expansion and a pipe diameter from a single pipe when a cylinder exhaust pulse hits the collector a refraction low-density pressure waves form and that travels upstream back to the exhaust valves and decreases pressure at the valve depending on the length of the runners peak performance shifts to differ in our PM you can also use the cylinder pulses from the other cylinders to help each other out and improve your scavenging performance so why would back pressure be seen as helping basically when people claim that a certain amount of back pressure is beneficial they're probably mixing up back pressure and scavenging that phenomenon where the movement of gasses through the exhaust system creates a partial vacuum that can actually suck the exhaust out of the cylinder think of siphoning gas don't do it just think of it all right the pool of the gas in the front draws more gas from the back in a perfectly designed exhaust you're helping to pull the air through the engine if the pipes too big you lose the effect if it's too restrictive the engines got more trouble pushing the air out a properly designed exhaust system maximizes this scavenging effect around a wide range of rpms a lot of times people who put a massive diameter exhauster header they'll see a drop in power because they've dropped the exhaust velocity significantly and as a result they lost some of the strength of the inertial effects of the exhaust because it's slower Gaspee oh hey let's check out the ultimate low restriction exhaust system a top fuel dragster each cylinder gets its own exhaust pipe which at roughly three feet long only serves to get the exhaust up and away from the engine in the process using the force of the exhaust to create a little extra downforce to lose traction oh man talking about all this exhaust sure is exhausting I am exhausted probably doesn't help that I always demand exhaust be pumped into the studio when we filmed hope you guys were all able to intake that information all Sacajawea home boys subscribe to donut thanks to fixed for sponsoring the episode fixed is a Bluetooth obd2 reader that links up with your phone you can click the link in the description to get 10% off with the code donut remember that fixed mechanic hotline they're often donut viewers a 10% discount that service to the fix is new proved they've got enhanced errorcode detection being able to detect manufacturer specific codes so you can be more competitive with those high-end scan tools and it does deeper diagnostics than used to so go to fix step calm and use the code donut at the checkout subscribe to donut there's little buttons to subscribe click on it so you never miss a new episode we got new stuff coming out almost every day of the week check out this episode of wheelhouse cuz it's really good Terra's episode of hot lap it's cool follow us on Twitter and Instagram at Dona Mia follow me at bids Bardot don't tell my wife that resonator didn't come with the car