If you're looking for 1 performance mod, plug and wire updrade with cutting the inside tube of the muffler if sounds perfect. But we all have experienced what will happen. You try this simple and inexpensive mod and you can not wait to see how much more you can do. Next you will want to change your reg oil to synthetic and mod your head gasket, change your drive sprocket, upgrade the carb, upgrade to a tuned pipe, install sickbike.com's shifter kit. Then you'll want to purchase the Franco Millini motor. Then after all is said and done, someone here will have attached a rocket engine to their bike. But hey, we all need a stepping stone for any kind of progress.