I bought a Scorpion Exhaust (full system) and love it. Hardest part was re-jetting the carb. Seems no one knows anything about it. Has an awsome deep sound louder than a BIG GUN, almost as loud as a Curtis Sparks. I have ran with this exhaust through mid summer through winter and havent had to touch the jets or air fuel mixture. Bike starts right up each time without using choke. Gave my bike (04' warrior) great throttle response.