I did the kit (including drilling the slide) on my bike and it made a big difference. For use at home I was also knocking about with a K&N installed; this will be a TwinAir foam element when I'm on my way. Drilling the slide primarily increases "pick-up", in my experience.
Oh yes, and make sure you tell anyone working on your bike not to just "tune it to the max" or you'll end up with a very powerful but highly-strung engine. The idea of the BD kit is to de-restrict the lump, not to make it a fire-breathing beast.
Do I remember rightly that the stock US bike makes about 28bhp? Ridiculous! I think after desmogging and jetting mine was making about 51bhp-ish, and it was much too highly tuned (screen over airbox and holes in side-panel).
Of course, all that's a-changing now...
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