Welcome to the forum. I am new here as well. As for replacement exhaust I would imagine a stock replacement would net the best MPG. Honda really dialed in the VX for MPG and anything aftermarket would likely be a setback unless you are after performance at high RPM's and aren't concerned about MPG. If it were me I would be looking into low budget/shadetree muffler shops on craigslist to have it welded up for cheap.
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