Sports exhaust system optimised for 70cc cylinders on 50cc vertical 2-stroke engines Peugeot always strives to offer the perfect product, and they believe they have found it with the R system. Developed from the Z system and perfectly adapted to 70cc sports and racing cylinders, the R system offers slightly more volume and a slightly wider cone, resulting in greater efficiency and a higher level of performance on these large bore cylinders. Although the R exhaust system has been developed specifically for the upgraded cylinders, it also works perfectly in combination with the standard 50cc cylinder. This scooter exhaust system is supplied as pictured, with a high quality carbon silencer, exhaust gasket and a complete installation kit. *Please note that this exhaust system is marked E and is therefore equipped with a restrictor washer in the downpipe. The restrictor washer can be easily removed to improve performance, but if you remove it, you may also need to adjust the carburetor jet and CVT roller weights to properly tune the engine for optimum performance.