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Right now it has dual 2 1/4" exhaust to glasspacks. I'm wondering if I could get any power out of 2 1/2 or 3" exhaust.



Depends if you have mandrel bends or not. If not go 1/4" up to size the pinch points.

That said I'd go 2 1/2 with mandrel bends. 2 1/4" would better suit a closer to stock build.

Bench racer extroirdinaire!