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Not too much louder than stock outside, no extra noise inside. Sounds a bit "puffy" to me when idling, for lack of a better term, but I think this may be the case anytime you have a straight through design and you can stand right at the end of the pipe (not stacks).
Overall I'm very pleased with it and would do it again. Oh yeah, and it was CHEAP!
NAPA sells a resonator that matches this muffler. The 3.5" model is p/n 21467. It is supposed to cut down the drone. If the BTM is a little loud for your passengers, the resonator is an option.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.