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It's an aftermarket exhaust system custom-fitted for your application that bolts in from the cat converter back.Pretty simple to install.The main reason that they're better is because most aftermarket mufflers flow better than OEM's.Gibson has some of the best catbacks that I know of.
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.