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Originally Posted by harryrcb
the 02 S stock exhaust inlets are 1 3/4" and the outs are 1 7/8" with the stainless steel exhaust tips (ornamental pipes as Porsche calls them) are 3 1/2" so on my car I went to 2" pipes coming from the headers back with 2 1/2" out plus ornamental tips. I'm a little confused with what you have there or what you want to do with it, but it sounds like it's going to be toooooo big. The new engine I'm installing in my box now (3.8 dfi S) will have 2 1/2 pipes going back with 3" coming out.
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My "plumbing" runs 2.25 from the headers (no secondary cats) to the muffler inlet that gradually necks up from 3' to 3.5 at the inlet . The exit diameter from the muffler is 4.5 and it gradually necks down to about 4' at the tips . What can I say, this is how the crazy dudes at 9ff designed it. Since, they have set the top speed record for a production vehicle 2 or 3 times now, I have to defer to their judgement. The exhaust sounds great, but I'm considering ways to make it sound more aggressive. With that said, what I am trying to do is reduce the size of the mufflers by installing ones that are smaller in size and diameter. The problem that I am encountering is finding something that is compatible with the inlet and outlet diameters. If I decide to eliminate them altogether and weld in some straight pipes, I'm afraid I'll end up with something that requires me to radio Cape Canaveral before I head out on a drive !
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