Flowtech Afterburner Series Mufflers are your very best bet for optimum performance and awesome sound. All Afterburners are made with an aluminized case for miles and miles of rust and corrosion protection. Their fully-welded construction offers stronger seams to prevent blow out under extreme conditions. Huge flow tubes provide blistering horsepower, while the sound tuned chambers provide unbelievable sound and minimize annoying resonance.