“for competition only! Not allowed in the German StVZO area! Max Quattrini with its Quattrini racing exhaust offers an optimal complement to its direct intake M1L cylinder. Same as the cylinder kit, this racing exhaust combines high quality hand made workmanship with the quality of a real racing sport product. The system is not only performance tailored to the M1L assay, the exhaust layout has an oval internal diameter of 29/33 mm. Since the engine block will need a lot of modification, assembly is complicated. Result: perfect complement to the M1L, depending on the degree of modification, it is a true all-rounder from city to high-end racer cruiser. Racing exhaust / steel / aluminum silencer / left hand Steel, clear paint, aluminum silencer, left hand SIP-TIP: Racing cylinder Quattrini M1L. racing shaft with 20/20 or 24/25 mm cone, carburetor 26-28, V-Force reed valve, VESPATRONIC ….. depending on the periphery, up to 25 hp possible. Christoph Maier, aka Stoffi, STOFFI-SIP-Racing Team 2009: “The Scooter runs perfect with this exhaust and the M1L 2009 24hp and a strong constant pulling The best exhaust for this kit our favorite for 2009 …. “