The KR axle-back replaces your Mustang's factory mufflers for an intense and aggressive exhaust growl. Exhaust gases flow freely with the KR system, improving throttle response. CNC mandrel-bending technology ensures smooth bends and a precise fit. MRT Performance manufactures the KR axle-back exhaust out of the highest grade 304 stainless steel. This premium material is durable against rust and corrosion resistant. As an added bonus, the KR axle-back is exceptionally light-weight at only 17 lbs.This axle-back exhaust system includes 4" exhaust tips that come standard in a polished finish. These tips can also be finished in Matte Black using Cerakote. Cerakote is a high temperature, durable ceramic coating. Cerakote offers a sinister look for your Mustang that can withstand the rigors of high-performance driving. They come pre-welded to the axle back. Select your preferred finish using the drop-down menu above.The MRT KR axle-back features easy, direct bolt-on installation. It clamps on directly in place of the factory axle-back. No drilling or welding is required.