No, you will not need the adj rear camber arms. I ran the OEM arms when I put my PSS9s on the car and did not have any issues at all.
I will say that when I installed the TMS Rod-End Rear Camber Arms on my car that I noticed the rear end gave more feedback and had less play but that is to be expected when going from a gel filled bushing to a pivot bearing. I love the things but they are not needed for the street.
PS: the driver's side bolt by the diff is a pain to install but worth it.
MODS: 03 M3, 6MT, PSS9, AFE Intake, El Diablo Exhaust, Turner Motorsports Rear Adjustable Camber Arms, PowerFlex bushings, 18'x9' square setup & one driver that grins ear to ear everytime he is driving it