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I'm currently in the planning phase of a exhaust system for a 1999 F-250 SuperDuty w/5.4L V8. The plan is to run stacks on it. I need to know what the stock pipe size is so I can find or fabricate a reducer to work with the pipes in the stacks, connecting it to the stock pipe up near the front of the bed.
The stack kit we'll be using is 4 inch diameter pipe, and it has the bends and splitter pipe, I just need the reducer to make it all come together.
Plan is to do the install at the end of July once vacation is all done and what not.
I don't know for sure, but the easiest way to tell is to get under it and measure it yourself. I personally own a 94, so they're probably different. Just climb under and take a peek.
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