I was wondering what settings you are using? I've played around with several settings, but still get "fluttering/very slight hesitation" particularly in 3rd gear hard acceleration. It feels like the ECU is pulling back the timing a little. I'm fully aware this had been discussed countless times already but someone might be able to advise? l have now "backed off" all 3 modes to 6, 6 and 6, but the performance has dropped off - the boost isn't as aggressive. My understanding is the 3 modes are as follows: Mode 3 = Boost Mode 4 = Fuel Mode 5 = Timing I've heard that REVO remaps can "overfuel" but don't know how true that is. I'd like max power with aggressive boost - not worried about fuel economy. I think 6 is the standard default? Anyone had the same issues and have you cured/improved it by playing with your SPS 3.