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I have the MadDad midpipe and OEM downpipes (among other things, see sig).
When I asked MHD whether I should run stage 1+ or stage 2+ OTS maps, they recommended stage 2 for the 1M. On stage 2+ maps, at WOT power deliver is smooth and logs look good but above about 5k RPMs actual load is slightly lower than load requested. Part throttle is perfect up to about 60% pedal input, but I have power surges if I ask for anything between about 60% to 80% pedal input. This occurs on 91, 93 or 95 octane maps (properly fueled). Just yesterday I decided to shell out another $49 for the Stage 1 pack, and flashed Stage 1+ 93 Octane. So far it seems the surging issue is solved.
My suspicion is that despite the 1M having better flowing downpipes/high flow cats compared to other N54 cars, they are not quite good enough for Stage 2+ power levels.
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1M track toy mods: BMS chargepipe, BMS OCC, ADE FMIC, ADE motor mounts, MadDad/Lightweight Ti exhaust, ADE custom oil thermostat/cooler, custom MHD tune, F10 550i clutch, Ohlins R+T, Vorschlag camber plates, M3 'vert FSB with Turner endlinks, Stoptech Trophy BBK.
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