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The best place for the filter was mentioned above. The 4" pipe is best found at a big rig shop. As for the exhaust, do a search on both sizes and there's plenty of "discussion" about both 4" and 5."
Rezvani's Latest Post-Apocalytic 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.