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, all options; Renntech, Akrapovic, Forge, P3, RevoZ CF bits, many mods
1988 BMW E30 M3: Hennarot, S14, stock
2016 Porsche 981 GT4: Guards Red, LWBS, SC, full leather
1998 Porsche 993 C4S: Zenith Blue, last aircooled widebody, Bilstein PSS10, Fister II + Fabspeed exhaust
2008 Audi B7 RS 4: Sprint Blue, Audi Exclusive Euro Bucket Interior, Premium+Titanium, many mods