This high performance muffler has been developed for vehicles with 4” sidepipes such as 1965–74 Corvettes or vehicles equipped with Hooker
Super Competition Roadster and Side Mount Headers. These Mufflers
produce an average of 23% more power than open Headers
and feature a high–flow, perforated core that operates at 99% efficiency. High temperature packing material absorbs noise while producing a powerful mellow sound. These mufflers, as tested on a 1968 Corvette with a 427 cu inch engine increased horsepower by 40 at a peak of
5500 RPM and 20 ft.–lbs. at peak of 4500RPM versus a leading aftermarket undercar header/turbo–style muffler combination. The outer case is constructed of durable 16 gauge aluminized steel protected by electrostatically applied high–temperature black paint. The inlet/outlet is a 2.5 perforated core in a 4” casing.