rxer311
01-16-2010, 06:15 PM
I was just reading another thread about a "chipped" car and it got me thinking about the exhaust of the car. I am still very new to Audi and the Audi tuning community so bear with me.
The last build I did was a 2007 STi and one thing was clear. A catback exhaust would net you 0 hp with no other modifications. When you opened up your downpipe, that was where your power was gained. The downpipe was simply the most restrictive part of the exhaust system so adding a catback exhaust was pointless. In fact many people would use a "stealthback exhaust" which was the downpipe utilizing the stock exhaust. This proved to be effective until HP numbers would get very high. Really the only need for a catback on a Subaru was because the sound of the flat 4 motor was just dead sexy.
So my question is whether a catback on our Audi 2.0t is restrictive. Are there gains with a catback exhaust on these cars or is it negligable? Is it just a noisemaker or are there actual performance gains with an exhaust?
On a different note I was actually thinking about a design for a custom catback exhaust. Basically the stock exh is 2.5" piping correct?
My design would be 2.5" piping comming off the catpipe and running to where the middle resonator muffler is now. In this space I would run a Magnaflow muffler 2.5" in and dual 2.25" out and run the pipes to the rear bumper with quad tips. One muffler would save weight and magnaflow mufflers are usually pretty quiet. Thoughts on this as well?
The last build I did was a 2007 STi and one thing was clear. A catback exhaust would net you 0 hp with no other modifications. When you opened up your downpipe, that was where your power was gained. The downpipe was simply the most restrictive part of the exhaust system so adding a catback exhaust was pointless. In fact many people would use a "stealthback exhaust" which was the downpipe utilizing the stock exhaust. This proved to be effective until HP numbers would get very high. Really the only need for a catback on a Subaru was because the sound of the flat 4 motor was just dead sexy.
So my question is whether a catback on our Audi 2.0t is restrictive. Are there gains with a catback exhaust on these cars or is it negligable? Is it just a noisemaker or are there actual performance gains with an exhaust?
On a different note I was actually thinking about a design for a custom catback exhaust. Basically the stock exh is 2.5" piping correct?
My design would be 2.5" piping comming off the catpipe and running to where the middle resonator muffler is now. In this space I would run a Magnaflow muffler 2.5" in and dual 2.25" out and run the pipes to the rear bumper with quad tips. One muffler would save weight and magnaflow mufflers are usually pretty quiet. Thoughts on this as well?