[ognam]

The M pack comes also with sport suspension; which means harder shock absorbers, shorter springs and thicker anti-roll bars. I'm not aware of any change in the gearbox (may be shorter gear ratios??). I know that in old bmw 1 series there were two different gear ratios depending on HP; for instance, 120 has shorter gear ratios than 118.

Anyway, you shouldn't notice any difference in the gear stick vibration when starting but the car should roll less when starting due to the harder suspension.