Newer PC-Vs should be wired to let the ECM control the ACRs- the first ones made were missing that wire, but DynoJet is aware of the issue and will fix the early units. As far as activating ACR function, that is done by the dealer via Digital Tech-They hook up the bike, enable ACR function and unhook it- 10-15 minutes tops, so there may be a minimal charge for DT use. The RevExtend function of the PC-V will raise the limit, not sure if it's 6200 or 6500- either way, most mild builds quit making power ~6K or less, so no real need for going much above that- just cuz yer spinning it faster don't mean you are going any faster. A quick set of dyno pulls will show you where the power starts to taper off. I feel the rev limit should be 10% after HP peak, ie: say 5000 RPM is the TQ peak, so IMO the rev limit should be @ 5500.