Compatible with 2005-2010 Ford Mustang GT GT500 with a 4.6L or 5.4L engine.; Flowmaster s Outlaw Axle-back systems are race-oriented systems designed to replace original rear mounted mufflers located behind the rear axle using factory style connections. Outlaw systems deliver an ultra aggressive interior and exterior tone and are suited to the enthusiast who wants the most aggressive components they can purchase. Like all Flowmaster systems the benefits include improved throttle response power and mileage. Designed for an easy fit these systems include all necessary parts and hardware for a relatively quick and easy installation.;