Seems like the V1 has a better curve.
The V2 has a bit more power (1-2HP...AMAZING.) but it's more ragged than the V1.
Think I'd stick with the V1 unless that 7-7.5K dip could be tuned out of the V2.
There's something in the engine and pipe combo that just doesn't like that RPM range, maybe a slightly different setup would yield a smoother curve.
Either way, grk was saying that the V2 costs $200 more, so the gains from the V2 (2HP all around?) wind up costing $100/HP.
How does that stack up to other pipes as far as $$$/HP ratios?