Thanks for the feedback guys. I know the exhaust is killing me, I just don't want to go to something that's going to be any louder than it is now.

3" piping with the biggest straight through muffler you can fit and it won't be loud.
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lol @ dynos which can't do simple calculus.

I made 240 whp with a 2.5" exhuast and GT2560 at 10 psi on a dynojet on a stock motored 2000 back in 2001.