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With 95.6 dB @ 2000 RPM, or 2.4 dB over stock, these mufflers are SAE-J2825 sound compliant in the USA. An excellent choice for riders that prefer a performance increase without serious upping sound levels. Approx. +16% horsepower, + 14% torque at just +2.4dB over stock. Note: Incl. O2 sensor plugs. Note: Above mentioned performance numbers were achieved by Kerker/Supertrapp on a stock 2012 H-D with stock catalyst equipped head pipe, without any fuel adjustments.