In my autocross bracket, I'm allowed a modified ECU, which means I can increase redline. But, the block and head have to remain factory. So, how high can I rev a blueprinted engine (not balanced, it's not allowed) on new stock valve springs? My CRX is also my daily driver, so I have to make sure whatever limits I push, they'll allow the car to run hard on the track and run reliably the rest of the time. Thanks