This exhaust will change color due to the high heat generated by the engine. -The material of the pipe is polished mild steel. you must paint it otherwise it will rust over time. IMPORTANT It is only compatible with Massimo Mini Bike MB100, If you have a different minibike, dont order it, it wont work for you. What includes? - 3 Stage Exhaust Header - 2 Lock washer - 2 Nuts - Premium Gasket Engine not included. Made in U.S.A.