No extra hardware. Nothing but an additional grey ECU and the sensor cables AFAIK.
I had some cash in the pot left over when I bought the car much cheaper than the list price.
Also I wanted to soften the blow of trading in my old 911
Madgambler
325i (E30) => Alpina B3.33 (E46) => Alpina B3s (E46) => 130i M Sport (E87) => Cayman S (987c) => Carrera S (997) => M135i (F21)