i know about the fuel screw but i want more than this to go compete at the local pulls how can i get more than timing adjustments and turning the screw and a bigger turbo?
If your rules allow go with at least an HX40 or H2E holset. That poor T04 is just way to small for that 504. Really even an HX40/H2E is too small, but it's light years ahead of the T04... $.02