^ Bear in mind that the UUC EVO kits will be VERY notchy with the normal OEM shift knobs. You'll be muscling through the gears every time you shift. You might as well factor another $100 or so into a weighted UUC shift knob.
Honestly, +++ $400 for a SSK, DSSR and a weighted shift knob is not worth it. I'm sure the understeer kit is almost as much fun, and the price is a huge bargain. I played around with the shifter in a MZ3 and it seems great.
'12 M3 6MT Alpine White + Fox Red Extended | '09 328i 6MT Space Gray + Black