Make sure you get a good alignment and corner balance on those. From what other GT3 drivers have told me (not GT3 RS, but still); Porsche assumes the car will be set up by a race shop with the owner in the driver's seat, so they don't do anything but a rudimentary alignment and no corner balance.
BTW: I want
'11 E90 M3, Mebourne/Black/Fox Red/Black, 6MT, PP2, heated seats, moonroof, split folding rear seats, iPod/USB adapter, Technic harness, JL XD 6/600.
'02 E46M3, Imola/Black, 6MT, CWP, no sunroof, Ohlins, Eibachs, PFC DD rotors, PFC pads! HAT Clarus/Legatia speakers, 2 big amps in the back.
'05 X5 4.4i, Imola/Black, Premium, Cold, HAT Imagine 6.5's, Intravee iPod adapter