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Depends on how that diameter change is implemented. But for a stock exhaust system, you won't feel the difference at low to medium rpms as much as you would at high rpms.
And a ten year old Honda D17? Should be making +/- 5 hp compared to stock. Those are reasonably robust little motors.
Still have issues with that pipe chart, because I've seen more power than that out of a 2" pipe... but we're not after maximum power here, anyway.
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