For big races I'm running a TNT Modded AXE Cobra, fantastic engine, as much power and torque as anything out there, plus 12+min on a tank of fuel, I've been running it with a Dynamite 007HT pipe, seems to work good,
for club races I've got an old rebuilt STS 28, works really good, but I can barely make a 6min qualifer with it, last race it ran out of fuel coming down the stragiht to finish my time, and the 2nd qual it ran out a few corners after I finished my time,