Lethal Performance has a variety of axle-back systems for the 2015-2017 Mustang GT. These systems work best when paired with a Lethal Performance resonator delete. The Lethal Performance shop car originally had a Roush axle-back paired with our own resonator delete system. Some of our in-house favorites include MBRP, Corsa, Roush, and Borla. You can never go wrong with any of the brands we carry!