The best way to get power out of suck a short stroke motor like that is to get a big cam +springs & retainers , a header, tune, and rev the piss out of it, and for the record a good p&p on average is 800 including flow sheets. Portflow charges like 1200 for a p&p, but when it comes to this mod, u get what you pay for. The last thing you want to do is give ur head to earls counsin scooters best friend bob so he can grab an air dremel and start grinding away. Go for cams and header and tune first.