My car is a June 2013 build and still has what is suspect are the original PS2s.
When I bought the M5 it had PS3s on it, which were not as good as the PS1 or PS2 apparently but really suited the car, I fitted PSS which were very good but I'm convinced caused the tramlining.
@Peter - what are you hoping to get from PSS that you wouldn't get from PS4S
Sent from my iPhone using Tapatalk Pro
Current:
'06 530d Silver Grey, '04 325Ci Orient Blau
Previous:
'03 M3 Silver Grey
'02 325Ci Imola Red II
'98 318iS Cosmos Schwartz