Back in the 1960s it wasn’t uncommon to see scores of muscle cars like Mustangs, Camaros, and the like lined up at the local exhaust shop to have a set of Thrush’s red Glasspack mufflers installed.

It remains a fact of life that many performance enthusiasts don't realize what loud exhaust systems do to the nonenthusiast. Consequently, those who react negatively to noisy rods, vans or bold street ...

The premise of the test was simple. First we'd select a test vehicle, then run all the mufflers on the chassis dyno to determine the horsepower output and back pressure of each set, and then test them ...