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It would be interesting to see the gain differences between the two but I doubt people have had the time to do it yet since their just getting off backorder...
I think there were a couple guys that were swapping from the V1 to the V2 pipes, but I'm not sure. I'll be upgrading from my V1's soon as well. I really doubt it'll be a big difference though.
What exhaust were you running with the first version of the ART's ?