I have the NM module and I have been pleased with its performance. I have run it on the low setting since I originally installed it. I am planning on running 100 octane fuel and switching it to the high setting. Have any of you already done this? If so, is there a learning period required for it to fully realize the additional power? And, when you switch back to 93 or whatever octane and change the switch back to the low setting does the module/ECU remember the original setting or is it required to relearn the low setting?