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American Thunder Exhaust System;Single;Single Rear Exit;50 Series SUV Muffler;California Residents: WARNING Flowmaster American Thunder Exhaust System - 17142 For the person who wants a subtle custom appearance with all the benefits that a Flowmaster Cat-back exhaust system provides. (Single out side) systems are the perfect choice. 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, power and mileage.