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I agree with Jaykay, there are also the factors in manufacturing such as cost containment and especially German TUV noise standards. I think TUV is the reason the intake sounds are so muffled. Some 986 information seems contradictory, for example, there are numerous people saying reducing the back pressure with headers would reduce the HP as well. Theory was based on a given needed amount of BP for the flat six to run correctly. In my experience the headers made a difference, I didn't measure it but I did hear and feel it. I've also noticed when reading about modded Porsche cars in excellence, exhaust is frequently changed in diameter or configuration for more power.
Last edited by Ghostrider 310; 03-25-2012 at 02:29 AM.
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