Flowmaster American Thunder Dual Exhaust System - 1986-93 Ford Mustang LX/1986 Mustang GT 5.0L RS003C02 or reverse seam as they

or reverse seam as they are sometimes called

625 in Bore

2011-2016 GMC Sierra 3500 HD

of torque on the dyno while out flowing the factory intercooler tube by 67-percent

7L OEM (HE351) Mount Manifold

Flowmaster American Thunder Dual Exhaust System - 1986-93 Ford Mustang LX/1986 Mustang GT 5.0L RS003C02 or reverse seam as theyFor the person who is looking for a complete Cat back dual exhaust system with an aggressive tone. With easy fit in mind, these systems are mandrel bent for maximum performance and include specially selected mufflers. American Thunder systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. Like all Flowmaster systems, the benefits include improved throttle response,