High-torque exhaust in a subtle design. Provides considerably more top speed. E-certified. For those who need a new exhaust and want more power but do not want to ride with a small and particularly sporty sounding exhaust on their scooter. Very good torque curve and excellent performance on 50cc and 70cc sport cylinders. This Tecnigas Silent Pro Exhaust System fits Kymco vehicles with horizontal cylinder AC or LC. Note: if the exhaust comes with E-certification, it can be easily used as a stock replacement without power increase. 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.