At the 150cc level you would gain MORE by doing the carb/pipe/cvt than you would by going with a cc kit. Get all the goodies for a 150, and you will be blowing away all the other scoots. The BBK for a 150 will add about 7-8 mph, and 2ish seconds in an 1/8 mile but the goodies can get 15mph, and 4 seconds off the 1/8th. If you do both you'd have a rocket but it may not last unless you spend major dollars on quality parts. I njust started getting all the bits for 2 engines (50cc) and spent close to 2g's. For the bbk/bits I'd figure 2g's for a quality 200cc set up, for just good 150 parts about 800-1'000.