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Good question. If you don't rev up very high then bigger exhaust isn't going to help very much, and could even possibly have the opposite effect as pulsating fluids have a sort of happy medium or Goldilocks size where bigger could potentially cause more restriction. Personally, I'd focus more on muffler restriction before trying different exhaust sizing.
If you do rev up your engine to a high RPM a lot then a bigger exhaust might be warranted. But most ecomodders don't usually do that very often, if at all.
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