The "R" is the evolition of the "Z" with more volume and a wider cone, making it the ideal complement for 70cc Sport/Race cylinders. It works well with 50cc and 70cc cylinders but its true efficiency becomes apparent with the 70cc Sport cylinders. For superb performance we recommend modifying the variator application. Yasuni Scooter "R" full exhaust systemImproves scooter performancePower gainRequires a modification of the variator developmentCombines lightness and rigidityWith certificate of approval Comes equipped with a good quality aluminium cylinder Exhaust approved for street use Exhaust Pipes Finish: Steel Homologation: CE homologated & Not approved in Switzerland