High-torque exhaust in a subtle design. Provides considerably more top speed. For those who want a new silencer and want more power, but do not want to ride with a small and particularly sporty sounding exhaust on their scooter right here. Very good torque curve and excellent performance on 50cc and 70cc sport cylinders. Fits all scooters with Minarelli engine with vertical cylinders part is supplied with E-certification Note: If the exhaust comes with an E-certification [when restricted], the system can be easily used as an original replacement without performance enhancement. This exhaust system is restricted in 2 places: one with two spot welds, fixed directly on the manifold flange and a second small restrictor pipe in the silencer body. Removal will give more horsepower, but invalidate the E-certification.