because they came different on 5 speed from the factory i would guess that some amount of low end torque could be lost. they made it smaller to speed up the air going through.
i'm sure almost any machine shop would be able to bore it out for you. look in the yellow pages to find a shop in your area and call them to compare prices.
oh and i dont think that going larger than 55mm would yield any benefits and there might not be enough material left once you get over 55mm
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