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We have tested many different muffler designs and will only sell those that pass our rigorous tests. The Aero Turbine and Turbine XL mufflers have proven themselves through the past ten years we have been selling them and continue to make power on the chassis dyno and on the street. We are so impressed by the Aeroturbine design that we purchased the patent and intellectual property and have been manufacturing them since 2013 to the highest standards. Aero Exhaust originally designed the AT4040 for the diesel truck market, they saw amazing gains and branched out from there. We are now providing mufflers for almost every make and model on the road.