honestly, i don't even attempt to race my GT. I have beat a GAGT bad, and a 4 banger hatchback jetta bad. I have had every GT mod including rockers, hvtb, hv3, wizair, fuel rewire, custom dhp tune, 180 stat, wires, plugs, downpipe, exhaust, etc, and still got my a** handed to me racing a bone stock GTP.
if you are going to do anything, just drop $600 and do a topswap. I wish I had gone through with mine when i had all the parts. That is really the best thing to do. You will eat mildly modded/stock gtps no problem. this is why i demodded my car, cuz I had all the GT mods with no extreme gains. With all the money i spent on GT mods and then add another $1000 i could have put a turbo on it and really made some power