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No difference in the tank ! The dual exaust is just very tricky to bend the tailpipes properly to get around the tank. It takes a good shop to bend them.

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I am wanting to put 3" on my duster and wondered how tight it would be. Friend got it on his '70 swinger so I assumed it would work on mine too.

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3" seems a little large unless you have lots of ponies under the hood, or like the sound.

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11.25:1, comp solid .590 lift, ported x-heads, m-1 intake, supercomp headers and a 4spd. It should do okay with 3" I am guessing, or at least I hope so.