# Understanding Cat-Back Exhausts: A Comprehensive Guide
## Introduction
Welcome to this week's video! Today, we’re delving into the world of cat-back exhausts. Yanaka Motorsports has generously donated a cat-back exhaust for our discussion, and we extend our gratitude for their contribution.
## What is a Cat-Back Exhaust?
Let’s begin by understanding what a cat-back exhaust system entails. The engine generates exhaust gases that flow through exhaust headers and into the catalytic converter. Anything beyond the catalytic converter—referred to as "cat-back"—comprises additional components: a resonator, extra piping, and a muffler.
- **Resonator:** Attaches to the catalytic converter and helps reduce noise by canceling out certain frequencies.
- **Piping:** Runs through the center, ensuring smooth airflow.
- **Muffler:** Further reduces noise before exhaust exits via the tailpipe.
## Why Choose a Different Cat-Back Exhaust?
There are several reasons to consider an upgraded cat-back exhaust:
1. **Appearance:** Stainless steel options offer a sleek, polished look, enhancing your vehicle's aesthetics.
2. **Sound:** aftermarket exhausts like Yanaka’s provide a deeper, richer tone without excessive loudness.
3. **Durability:** Constructed from stainless steel, these systems are rust-resistant, offering longevity compared to older or cheaper alternatives.
4. **Performance:** Enhances engine performance by reducing back pressure, crucial for modified engines.
## Technical Comparison: Stock vs. Yanaka Cat-Back
To gauge the benefits, let’s compare stock and upgraded cat-back exhausts:
- **Inner Diameter:**
- Stock Exhaust: 1.8 inches (45.7 mm)
- Yanaka Cat-Back: 2.26 inches (57.5 mm)
- **Area Comparison:**
- Stock Area: 1 unit
- Yanaka Area: Approximately 1.6 units (a 60% increase)
This size difference translates to performance gains, especially for engines producing up to 225 horsepower, where the larger diameter reduces restriction and enhances airflow.
## Conclusion
In summary, a cat-back exhaust system significantly impacts your vehicle’s appearance, sound, durability, and performance. Upgrading, particularly with Yanaka's model, offers substantial benefits for modified engines, delivering noticeable gains in power and efficiency.
Thank you for tuning in! Stay tuned for more insightful videos on automotive upgrades and modifications.
"WEBVTTKind: captionsLanguage: enhello everyone and welcome to this week's video today I'm going to be talking about catback exhausts Now yanaka Motorsports was kind enough to donate a uh catback exhaust for the use in this video so first of all thank you to yanaka for that um so a catback exhaust basically let's go over what is it first so we've got our engine uh and from the engine the exhaust is going to head to the exhaust headers and then to the Catal catalytic converter so anything past this catalytic converter is considered the catback hence back from the cat so we've got a resonator we've got additional piping and we've got a muffler so the resonator here we've got what's going to attach uh here to this catalytic converter and it'll travel through this piping and then go through the resonator which will cancel out some of the noise the next step we have is the piping which goes through the center and that will pass along through and finally after we go through the piping we're going to get to the muffler and the exhaust will travel out and then head out the tailpipe so these little black things you see here these are just uh the metal hangers and basically you're going to have uh hangers in your car already where the exhaust is hanging on with little rubber mounts and you're just going to slip these right into that so that's what those are for so let's talk about why you may want a different catback exhaust so first of all if you want a different appearance you know something stainless steel it looks nice uh that's something you could go for also a different sound so for yanaka what they do is they kind of make it uh it's still pretty quiet so it's not louder like a lot of aftermarket exhausts out there but it has a nice deep uh hum to it uh quality of course uh since this is stainless steel you're not really going to have to be too concerned about rust um and that can be a problem with older exhaust they may rust out so you may just want to replace it uh and then finally performance which is what I'm the most interested in the stock Engine versus an upgraded exhaust so basically if you just have a stock engine and you haven't done any modifications to it you're probably not going to get too many gains from a catback exhaust but if you have added modifications to your exhaust your catback may become a burden if the piping is too small and it has free flow up until that point so if your catback is causing too much back pressure by changing it out for a larger diameter pipe you can get better uh performance uh and finally that's the ultimate goal we just want to reduce back pressure here so the more upgrades you have uh the more useful it is to switch out your cat back and you'll see better gains from that so now let's check out the stock diameter piping versus the yanaka catback piping so the current exhaust looks to be about 1.8 exactly 1.8 in uh for the inner diameter of the exhaust or 45.7 3 mm so the inner diameter of the yaka exhaust looks to be about 2.26 in uh in diameter or 57.5 mm okay so now that we've determined what our inner diameters are for both the stock and the performance catback uh we can find out what the difference is in the area so with the inner diameter of 45.7 mm on the stock versus the 57.5 mm on the Ina catback we can find out what some simple math dividing the areas that the yaka is about 58% more area so about 60% greater area all right so with the stock exhaust which has probably been optimized by the engineers for 140 horsepower once you increase the horsepower and get greater than 140 uh then you're going to have some restriction in your exhaust system or it's likely that you could and so going with the same uh theory that the engineers who created this since the unaka is about 60% bigger we can find out kind of what an ideal horsepower range would be for this yaka catback exhaust so we simply multiply the 140 by 1.6 for the 60% increase and it gives us about 225 so for an engine producing about 225 horsepower you could probably see some significant gains from this catback exhaust so the whole kit alt together this is where it will connect with the catalytic converter come back through the resonator that'll connect to the to the pipe which connects to the muffler and finally out the tailpipehello everyone and welcome to this week's video today I'm going to be talking about catback exhausts Now yanaka Motorsports was kind enough to donate a uh catback exhaust for the use in this video so first of all thank you to yanaka for that um so a catback exhaust basically let's go over what is it first so we've got our engine uh and from the engine the exhaust is going to head to the exhaust headers and then to the Catal catalytic converter so anything past this catalytic converter is considered the catback hence back from the cat so we've got a resonator we've got additional piping and we've got a muffler so the resonator here we've got what's going to attach uh here to this catalytic converter and it'll travel through this piping and then go through the resonator which will cancel out some of the noise the next step we have is the piping which goes through the center and that will pass along through and finally after we go through the piping we're going to get to the muffler and the exhaust will travel out and then head out the tailpipe so these little black things you see here these are just uh the metal hangers and basically you're going to have uh hangers in your car already where the exhaust is hanging on with little rubber mounts and you're just going to slip these right into that so that's what those are for so let's talk about why you may want a different catback exhaust so first of all if you want a different appearance you know something stainless steel it looks nice uh that's something you could go for also a different sound so for yanaka what they do is they kind of make it uh it's still pretty quiet so it's not louder like a lot of aftermarket exhausts out there but it has a nice deep uh hum to it uh quality of course uh since this is stainless steel you're not really going to have to be too concerned about rust um and that can be a problem with older exhaust they may rust out so you may just want to replace it uh and then finally performance which is what I'm the most interested in the stock Engine versus an upgraded exhaust so basically if you just have a stock engine and you haven't done any modifications to it you're probably not going to get too many gains from a catback exhaust but if you have added modifications to your exhaust your catback may become a burden if the piping is too small and it has free flow up until that point so if your catback is causing too much back pressure by changing it out for a larger diameter pipe you can get better uh performance uh and finally that's the ultimate goal we just want to reduce back pressure here so the more upgrades you have uh the more useful it is to switch out your cat back and you'll see better gains from that so now let's check out the stock diameter piping versus the yanaka catback piping so the current exhaust looks to be about 1.8 exactly 1.8 in uh for the inner diameter of the exhaust or 45.7 3 mm so the inner diameter of the yaka exhaust looks to be about 2.26 in uh in diameter or 57.5 mm okay so now that we've determined what our inner diameters are for both the stock and the performance catback uh we can find out what the difference is in the area so with the inner diameter of 45.7 mm on the stock versus the 57.5 mm on the Ina catback we can find out what some simple math dividing the areas that the yaka is about 58% more area so about 60% greater area all right so with the stock exhaust which has probably been optimized by the engineers for 140 horsepower once you increase the horsepower and get greater than 140 uh then you're going to have some restriction in your exhaust system or it's likely that you could and so going with the same uh theory that the engineers who created this since the unaka is about 60% bigger we can find out kind of what an ideal horsepower range would be for this yaka catback exhaust so we simply multiply the 140 by 1.6 for the 60% increase and it gives us about 225 so for an engine producing about 225 horsepower you could probably see some significant gains from this catback exhaust so the whole kit alt together this is where it will connect with the catalytic converter come back through the resonator that'll connect to the to the pipe which connects to the muffler and finally out the tailpipe\n"
