I don't know, man. My MKIV is stock, plus 3 inch exhaust and that's it. My buddy and I did a few 40 mph pulls with his 5 speed turbo mkiii. He has hardpipes, a 60-1 upgraded ct26 running 12 psi steady (according to his AVCR), intake, and full 3 inch exhaust. He'd immediately get about 1 or 2...