Maicson Performance 40mm Throttle body Upgrade Kit - Vespa STAGE 2This upgrade kit will delivers More Horse Power and Engine Torque to your Vespa Engine. INTAKE MANIFOLD The Intake manifold is special designed for the 40mm Throttle body, but fits also with the original Throttle body. EXHAUST The Racing Exhaust is Designed for Stock Cylinder and for a Tuned Ported Cylinder Head. AIR FILTER A Performance Air Filter will give the Throttle body all fresh air he ask for!! COLD AIR INTAKE More Air will go true this Bigger