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I am not using that pipe, however flowmaster has a very good reputation. Mine is only 3.5 inch down to the tranny...then it is 4 inch. That one says it is 4 inch...looks like right after the flare for the turbo. If I did not have one already, I would probably buy that one.
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.