Naraku Cross Over Performance Exhaust for 50cc 4-Stroke 139QMB Chinese ScootersGY6 50 Performance Crossover Exhaust from Naraku CARBON FIBER LOOK TO IT Looking for that two stroke racing style but have a four stroke well here you go two stroke style for GY6 50 Four Stroke. Please choose your look. The Naraku crossover GY6 50 exhaust will derstrict your stock exhaust plus get rid of that weight of the stock exhaust. FLAT BLACK NARAKU RACE QMB139 Race Exhaust RP-NK400.01 Item Nr.: NK400.01 EAN/UPC: 4250362417039 139QMB GY6 50cc Exhaust.**