As high performance parts/tuning parts/racing parts, this performance filters kit will fit almost all scooters(inclgoped, bladez, razorback),2-stroke large pocket bikes(inclcateye, x1, x2, x5, x7), mini choppers, mini harleys, leafblowers, chainsaws, etc. Air filters for 43cc,47cc,49cc,50cc,70cc and 110cc are available for both 2-stroke and 4-stroke engines. There are alum stacks available. Other performance parts/tuning parts/racing parts are also available for scooters, mini-motos, pocket bikes, dirt bikes and atvs. For example: 1) different types of exhaust pipes/mufflers 2) different types of clutches for both 2-stroke and 4-stroke engine, air-cooled and water-cooled, clutch springs 3) cylinder, pistons, rings, pull starter, and gearbox,4) carburetor, air filter, stacks, intake manifold, gasket, jets for both water-cooled and air-cooled 5)brake caliper, brake level, throttle lever, chain, sprocket, foot-pegs, front fork etc.