The key to power on these is the head - and while we don't show exact details about the final port, this is the process we undergo to get there. The stock 450 is about 53 hp as delivered off the showroom, with a pipe and an ECU we usually see 55. To take it up to 70 is a huge gain - one that we are really proud of on our dyno. This is coupled to our custom tuned GET ecu, race fuel, and a megaphone pipe. With a conventional exhaust, this package is good for about 66 hp.