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Mine was 2" from the cats all the way out the back. I had the shop use 2.25" and it seems like I've lost a bit of low-end torque, but it seems to have a little more HP pulling up hillsides...it's odd really. If I had to do it over again I probably would use the standard 2" pipe.
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.