In house muffler test, Caney Engineering, Ealing, England Engine: 3.2 liters, 10.8:1 pistons, flycut for Solex (901) cam, 46 mm Webers with 38mm venures, 1 5/8" Triad headers, flowed heads, Euro (centifugal) distributor recurved, K&N air cleaners, MSO ignition, Amsoil 10-40 synthetic oil. Baseline was determined by established maximum horsepower with 24" open megaphones attached. This occurred @6100 rpm with a reading of 289. Muffler tests were done at the same rpm with no changes except for final exhaust. Horsepower ---------- Open tapered megaphones 289 off meter Triad dual outlet track unit 285 100 Db Triad dual outlet 90 dB unit 283 88 Db Leistritz (factory sport) 2 outlet 279 103 Db Triad single outlet with crossover 279 Borla 277 Super trap (disced to 95 dB) 275 Flowmaster 273 Bischoff (factory stock) 272 84 Db Bursch Steelpak(supplied with SSI systems) 270 Ansa (4 pipe) 269 Supersprint 267 Notes: On the units where decibel readings were taken, they were obtained by methods outlined in California DER Supplement 82, Part III, 17-18.76 The possibility exists that slight differences of comparatives could occur with engines/headers of a different configuration or horsepower band.