Quote Originally Posted by 89notch View Post
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.
It could be. The plan is to replace the turbo after the motor is built - right now that 68 will make more than enough boost to send a rod out the SBE. Decided to do the 4 inch now since it was at fab and same time down the road. Plus it add's the "cool factor" as well.