best thing would be to make up some pipe the same length as the cans, that you could bolt to the chambers... Then you'd be spot on jetting wise and noisy as hell too!! Hell, you could even flare the ends and deafen even the hardiest MotoGP mechanic!
I've tried my old 28 without just one can, as it snapped off while riding once... My ears were honestly ringing for about a day!
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NSR300R - Why did i ever have a 250...