so far there's not been a problem on mine. my local dealer will do allignment checks/tuning for me for free b4 the first 5k. contact your local dealer and mention this as an issue. lexus's customer service is incomparable (well, maybe my local one just kicks @$$).
ISabelle (car name) - Black 2006 IS350 Sports Package + Navi (HACKED) + Mark Levinson Sound
Red Out on Tail light, 3M Clear Bra on full front done by Aerotect, 35% Tint All Around
Joe Z Intake, Tanabe NF210 Springs
Volk LE37T Glossy Black Limited Edition
19x8.5 +35 offset Front, 19x9.5 +43 offset Back