What's the Ford Explorer exhaust pipe size?

The exhaust pipe size on a Ford Explorer is 2.25" in diameter. Lets face it; moSTStock exhauSTSystems are heavy, restrictive, and worst of all, quiet. The quick and easy way to choose what diameter pipe You will need from the headers to the mufflers is to go back to the old rule of thumb. For every 100 horsepower, 1 of total pipe diameter is needed across the system. For example, A500 horsepower engine needs a 2.5" dual exhaust. This, of course, is a rough estimate, and there are several complex mathematical formulas to help You discover the perfect size of pipe to use.