Quote:
Originally Posted by trainwrex
Just seen some of the post on my build thread on Nasoic and Geoff from full race seems to think that my 3inch cat is the biggest restriction causing the bottle neck. I have spoken to Tony Knight about this also and he came to the same conclusion that the cat and the 3inch exhaust is causing a big bottleneck high up in the rev range.
So looking at replacing my titanium exhaust with a 3.5inch/4inch variety and maybe quietening it down with an extra muffler?? thoughts?
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So I might have been on the right track, but I was just sitting there LOL.
As Kato says, bolt up a quick test system and give it a run on the dyno before anything gets made up. I used to run a 4" X-Force dump into a 3.5" system on my 02 STi years ago so they are around if you are luckt enough to find one not being used somewhere.