Well I just had the constrictive 1 7/8 piping someone put on my car replaced with 2.5 pipe and a Flowmaster muffler. Wish could have found someone to install 3 mandrel bent tubing, but I'll have to do that myself when I can have the car down for awhile. Car still blows some smoke due to a worn turbo, but doesn't detonate and smoke as bad as it did before. There is a major difference in high end torque. Now 1st and 2nd gear have a little use. Before today they were WEEEEK! Hey if Ida known these cars had so much potential I woulda got one along time ago. The only other Z I ever owned was 240 #007980. Had very unique engine parts. I still possess the title and tags as a reminder. Next up: replace turbo cartridge and use a bigger compressor wheel.