Handmade resonance system for Vespa Largeframe. Designed for powerful 200 cc setups: Malossi MHR 210/221, Quattrini M232/M244 and VMC 244 Explorer. Early, powerful torque build-up with clean revving - practical on the road and resilient on the track.
Fits all vehicles in which a PX200 or Rally200 engine has been professionally retrofitted (PX layout, large frame).