At least get the boyesen reeds. I just installed a new set last week, and it made a big difference. It felt like it took a day or two to tune them in right and break them in, but I have better throttle response and a slightly higher top speed. I can now hit mid 30's easily, and Im running an 80 qt50 thats stock with boyesen reeds and K&N air filter. Supposedly, the reeds will do a lot more for you when you get the expansion chamber exhaust from Jemco.