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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