Hush Thrush mufflers provide that vintage sound you love with the performance you expect. The improved tri-flow design of the Hush Thrush enhances flow and performance. All mufflers are reversible for maximum flexibility. "The Vintage Sound... Today's Power of the Hush Thrush makes it the perfect choice for that classic hot rod and today's muscle car. Thrush has made hot rods hotter since 1966.