For the person who wants a subtle custom appearance with all of the benefits that a Flowmaster Cat-back exhaust system provides, SOS (Single Out Side) systems are the perfect choice. American Thunder systems deliver a moderate to aggressive tone and are suited to the enthusiast who wants their performance to be heard. 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 easy installation.

Part #817551



✓ Stainless steel construction
✓ Dyno proven performance gains
✓ Full 3.5 in. mandrel bent system
✓ Lifetime limited warranty
✓ Premium Flowmaster quality