Fits: Honda XR50, CRF50 or their copies, Chinese made pit bikes, 70cc, 110cc, and 125cc. 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 CRFs and gives your mini better throttle response and more power Note: No hardware included!! Features: Big bore Aluminum alloy muffler Removable pipe guard 28mm head, 45mm eye to eye