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I've got a 2004 F150 4.6l STX. I've already decided on Flowmaster.
My question is, since I'm pretty much going to run the same factory pipe that's already underneath the truck and just cut off the factory muffler, what size flowmaster do I need? From what I've found it looks like usually a 2.5" flowmaster is used, is that correct?
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.