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 or their copies, Chinese made pit bikes, 70cc, 110cc, and 125cc. Features Big bore Aluminum alloy SILVER TIP muffler Removable pipe guard 28mm head, 45mm eye to eye