this weekend at the colma speed run we hit 130 mph in 1000 ft. not bad for just a trail turbo and a completely stock apex engine, boost was set at 12 psi and was running acouple gallons of race gas in the tank due to the higher compression ratio of the stock engine. with a lower compression set up you can run this boost level on pump gas all the time. personally i prefer to run the stock engine at 8 psi for trail riding which makes 240 hp, then turn it up to 12 psi for radar runs with alittle race gas to make over 270hp. the simons cpr turbo apex is really proving to be a potent duel purpose package.