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.
Tecumseh Racing's Jerry Romanick makes adjustments to their small-block MoPar test mule, while Thrush's Peter Roberts digs through the mounds of mufflers gathered for these evaluations. Traditionally, ...
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