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 ...
Put mufflers on a 1300hp big-block Chevy, and most enthusiasts would guarantee that you'd choke the horsepower down. But the test of Borla's new 4½-inch Shoot-Out Series muffler revealed that ...
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