Until we see proof otherwise, the HKS / Rotrex kits will not make as much peak power, and will not make as much power where it counts in the power band on the S65, compared to the Vortech kits with equal psi levels, that's just an objective fact. There are countless dyno's, trap speeds and 60-130's, that confirm this, rather than just one's arbitrary opinion or one dyno comparison. To be fair we have seen a dyno comparison where early and mid power ranges favor the HKS/Rotrex and peak power the Vortech, BUT the dyno comparisons are misleading, as both kits were not running the same psi or Water Meth, one would think those are important factors.
The S65's REAL power range, except from a dig, 1st gear ONLY, is ~6500/6800 to redline, the Vortech kits generally make more there, at times with less boost, WHERE IT COUNTS for most people racing in a straight line, if you want to argue about optimal power range for, tight turns, track, daily driving, etc go for it, but I'd say most people buy a SC'r kit to go faster in a straight line, not for track use, and until someone actually proves otherwise, the Vortech is the better blower for the S65 in that respect.
08 E92 M3 DCT - Bolt Ons - 60-130MPH 10.71s - 11.88 @ 118MPH - 377WHP
ESS VT2-625 SC 60-130MPH 6.80s - 11.30 @ 129.3 MPH 586WHP / 379WTQ @ 7.2psi - 94 octane / Water meth
ESS VT3-750 - 60-130MPH 6.44s - 10.81 @ 135.13 MPH 690Whp/463Wtq@13.5 psi