V2 can only be good for another hp or so, in fact, in a magazine I have here, the V2 was outperformed by the V1. The only difference however is that the V2 provided a little more "overall power gain", in the lower rev ranges.

Really is just a marketing thing and I wouldn't waste the extra $100 or so that it costs, I'd spend that $100 on something that actually adds power....like a camshaft regrind that can be purchased for less than $200....or something!