Originally Posted by nachob
Im interested too. I think the 1M has enough power already, but quicker throttle response would be a great thing for a tuner to do. I think the M button is fun, but it is touchy and I have tried it both ways and find it too sensitive for my new-to-M-car posterior. I'm learning to manage the torque and traction still and keep the the nose pointed forward. I don't believe touchy throttle gives you better control. If you believe that try heel and toeing with with a Honda Accord's overboosted brakes or the Acura TSX. Even the Blue Angels put stiffer springs on their sticks for better accuracy and control.
You don't necessarily need a tune to get improved throttle response/lessen lag, you can achieve so from some bolt-ons. Aftermarket (or N55) midpipes for one, and an appropriately sized FMIC. I say appropriately because too big of an IC can actually worsen lag.
M button = Sprintbooster. I use it most of the time, except for casual driving/in city traffic/congestion, etc. even though it makes the car more 'edgy' with in engaged, I like the on-demand responsiveness.
2011 BMW E82 1///M: AW, ZPP+ZCV, HK, Apps; Akra CF+Valve control, MadDad mids, K&N, Forge FMIC, P3gauge, EuroTails, Tint, CF Mirrors+Spoiler+Roof+RevoZ diffuser, 10mm H&R, IND grills+gills, xCDV, LUX AE
2008 Audi B7 RS 4: Sprint Blue, Audi Exclusive Euro Interior, Premium+Titanium Package, EPL Tune, Stasis Ohlins MS coilovers, Milltek valved exhaust+DownPipes, Alcon BBK, Tint, ADR V1, Lidatek, Lamin-X, Strasse Forged SM7 3-piece concave wheels, 275/30/19 PSSs, Euro flat-bottom steering wheel, JHM SSK