[mowflow]

Correct me if I'm wrong but doesn't the performance pack on the 120d involve BMW remapping the engine? As far as I'm aware there are no after market custom maps as nobody has cracked the encryption yet.

There are plenty of off the shelf tuning boxes about but they are intended for the standard 120d map so if the performance pack means your engine map is different who knows what might happen if you plug one of these in. The Ptronic boxes usually have one of the highest claims and it states 238bhp for that engine. However, these things are usually a little optimistic in their claims.