It's everything you need to turn your lackluster, 54 hp 2020-21 500 or 501 into a 70 hp monster, minus the end cap. This kit uses the oxygen sensor delete, booster plug and high pressure fuel regulator to add the fuel needed.  From the perfect Fueling the fuel adders  provide, to the free flowing exhaust End Cap. It has the intake tube, so you can take the reeds out of the intake tract, the Grunt Exhaust Manifold exhaust manifold for better bottom - mid power, the high flow 90 gas Tank Fitting, the Fuel Rail and the Large area quick Disconnect Fuel Filter. It's all you need for your bike to run like a dream!  These are for USA and CANADA spec BIKES ONLY. EUROPEAN and AUSTRALIAN bikes use the kits for your bikes please