The FTR pipe was a copy of CPI's pipe and made 5hp less on the dyno. CPI is the only way to go and they make max HP at 7500 on race gas and 7900 on alky. You will need to degree the exhaust port timing and make sure it is where CPI says it needs to be. Call them. They are very helpful as well. I made custom rubber mounts that let the pipe float in place so as to not ever crack. Bubba