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In a Ford Explorer, the exhaust pipe diameter is typically 2.25 inches. Most factory exhaust systems are heavy, restrictive, and too quiet. An easy method to determine the proper pipe diameter for the entire system, from headers to mufflers, is to follow a general guideline: for every 100 horsepower, you should have 1 inch of total pipe diameter. For instance, a 500 horsepower engine would ideally require a 2.5-inch dual exhaust system. While this is a basic rule of thumb, there are detailed mathematical formulas available to help calculate the exact optimal size of pipe to use.
The exhaust pipe on the Ford Explorer comes with a stock diameter of 2 inches.