Compatible with 1987-1996 Ford F-150 truck with a 4.9L, 5.0L or 5.8L engine.; For the person who wants a subtle custom appearance with all the benefits that a Flowmaster® Cat-back exhaust system provides. S.O.S. (Single out side) systems are the perfect choice. Our Force II® systems delivers a moderate exterior tone and mild to moderate interior tone, and are suited to customers looking for efficiency improvements without a lot of noise. This system is constructed from large 3.00 in. mandrel-bent aluminized steel tubing flowing into a 70 Series Big Block II™ muffler for a deep mellow tone. The 3.00 in. tailpipe uses the factory hangers for a quick and easy installation and is finished off with a turn down style tip cut into the tubing.