my boy had gsr with jsrc in hatch, he had a crv pulley which up the boost to 11psi..the car was quick, the only problems it had was it ate a lot of belts and it was pointless to race off the line since its instant boost..all you do is spin..but the motor eventally went..he blew his rings...but with boost kickin in right when you floor it or give it more than half throttle is going to put a lot of strain on your motor.