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Join Date: Nov 2002
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True Furious, but that's using a car that has been tweaked to the max allowable as it is. The M3 is a car built specifically for performance, so it's already got the most efficient exhaust design allowable by law (thus no straight pipes and the cats have to be factored in). Also keep in mind that the M has dual exhaust pipes.
When you take a car that isn't as engineered as the M, I'll use (Oh the HORROR) an Integra as as example (but you can use just about any non-performance oriented car here) and change the exhaust the right way you will get more gains than that. I have seen Dyno plots of Integras gaining as much as 10 horses (rare however, mostly the average was 8) and almost comparable torque.
The trick is to acurately match your exhaust diameters to maximize airflow from the engine out. The more efficient you expel exhaust the better performance you will get out of your car. From what I remember, exhaust gasses are expelled in pulses. Too big of a diameter and your pulses don't expell efficiently causing exhaust gasses to actually re-enter the combustion chamber. Too little and you have too much back pressure due to the build up of pulses on their way out.
Anyway, where was I going with this .... oh yeah, if you match a set of high flow cats with your cat back exhaust on your car you will get better gains than what you've got posted obove Furious. I'm not saying you'll be outrunning M3s! For God's sake calm down. I'm saying more than 1 - 2 horses. Add a set of aftermarket performance headers and it gets better. Do a complete hookup - Headers/Intake/Cats/Exhaust and you'll have very noticeable gains.
I think I'm done here.
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