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Well I believe you just use Pi to calculate it. Using Pi I get two 2.75" diameter pipes being closest without going way over. If you step up to 3" pipes you get quite a bit more volume than you need. Stepping down to 2.5" duals you end up loosing an awful lot. It looks like two 2.8" pipes would be about perfect but good luck finding that size!
I could be off on my thinking since I'm figuring area here not volume but I think it applies, and I'm no math guy to say the least.
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