You're talking about SMG tranny. -Very expensiveOriginally posted by archiebrown
I think a Step 330 means a semi automatic transmission.
Some BMWs now, especially the M series have a pre-emptive (or dual plate) clutch which guesses the gear you're about to select and gets ready to change for you. This means (according to my BMW fanatic of a mate) that when you actually change gears the cars auto-clutch changes gear in about 1/100th of a second. Not sure if the 330 uses this tho.
Steptronic is basically an automatic that lets you manually chose the gears. -Not very expensive.