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Hmm, didn't know that. Dad's '80 F-350 has the tanks setup like yours but with the spare mounted in the bed like they did with dual tank Rangers. It also has the big spring loaded "farm hitch" that probably displaced the spare from being under the fuel tank. I figured since that is how they did it on dual tank Rangers that is probably how they would do it on dual tank fullsizes as well.
Well, I had it done by a shop, it seemed fairly easy, he cut the pipe after the cats, welded on the Flowmaster and hangers and ran piping out the back. If your going to run it out the side than that would be easier, you could run it right after the muffler and out the side and not have to bend it around the back. You can put it where your existing muffler is and use those mounts.
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