Xan: Great find. NASCAR on their own site showing what the fans should do when they want to install a performance muffler. And taking up a large part of the screen is an Aero muffler box and muffler. They actually state that you should install a high performance muffler LIKE AERO to improve horsepower, torque, decrease engine heat for longer life, and improved mileage. NASCAR SAYS SO.
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