Mark, if you put a 4mm longer ball cup on the shock, then you are taking 4mm out of the "up travel" as the actual ball will be held 4mm further away from the body.
That said, if you bring the shock body down by 4mm (by lowering the tower), I think you are limiting the up travel by the same amount. Of course moving the tower has other effects - ultimately the CoG is lowered, as is the wing.
Even if both do limit the up travel, I think the piston position within the oil/body would be different at ride height. Depending on how the shock is pressured, this could make a difference to how the shock reacts, which of course could produce different results on track.
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Matthew White
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