High Performance Big Bore Muffler Exhaust Pipe Assembly for Honda XR 50 CRF 50 XR50 CRF50 Chinese 70cc 110cc 125cc Dirt Pit Bike SDG SSR Complete high performance big bore exhaust system This is a complete one piece exhaust system from the head pipe to the tail section. This will make your bike breath with any engine modifications, and also sounds great with a stock bike.This PIPE makes your mini have that deep throaty sound like the big CRF's and gives your mini better throttle response and more power Fits Honda XR50, CRF50 and their copies Fits Chinese made 70cc, 110cc, and 125cc pit bikes Big bore 38.18mm big head