Hi CTS 2007 43000KM my car has stiff ride i can feel every bump on my bottom with little hard turning on both direction NO caution or any indication of noise , went to dealer after doing their inspection told my LT upper control arm &RT lower control arm got to be replaced and everything's warranty coverage my parts on order should come next week my question is can control arm cause these problem ? on my basic knowledge that would be strut also since i bought this car brand new determine while going on high speed feel air leak sounds like coming form windshield send it 2 times to dealer they told me adjusted driver and replace passenger weather strap but still leaking friend of mine who work in caddy dealer told me 2007 has manufacture defect on that case do you guys have the same problem, i can feel outside environment THANks