Quote Originally Posted by gzbs197 View Post
JIMS SVT - There is no air filter on the turbo - just a turbo guard screen.

89notch - its 3" coming off the manifolds then back to the stock over axle tubes and then FRPP GTA mufflers.
I made right at 1k to the tire with a 3 inch downpipe all the way back to tailpipes. I think your problem might be that 68mm exhaust wheel. The 4 inch exhaust won't hurt but I would be willing to bet that 68mm is causing some serious back pressure.