These are the most common sizes and shapes of the XR-1 mufflers. The oval is the most popular for street cars because it doesn't hang down as far as the others and has more packing material. After all ...
Hot rods are known, among other things, for their loud exhaust systems. It would seem to the disinterested observer that the only thing at issue is how loud a car's exhaust system is, and to that ...
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