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Get some long tubes and run dual 2.5" pipes. I recommend a turbo muffler, they perform well and are quiet until you get on it. You can get cheapies for as little as $20, or get a bit more spendy and go with a better flowing turbo (I recommend Dynomax Super Turbo). Glasspacks are just obnoxious and not necessary for a stock motor.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
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.