If you wanna take it to the next level there are 2 options. First, find a pro motor shop (again I can reccomend in so cal) which will port and polish you intake and exhaust tract and boo ya ****, you´ll get some massive HP. The next is to buy a used Fuel injected gsxr750 motor do a port, polish and then drop THAT in your can-o-tuna, your buddies won´t get far. This might set you back about 3g´s though (cheaper than buying an R1 and you still get the Katana looks and comfort) Put that in your pipe and smoke it!!!