The symptoms are as follow: 1. car makes a "plopping" sound, the faster you go, the more frequent these sounds: "plop plop plop" X1000 real fast (at high speeds) 2. at higher speeds, the steering wheel also vibrates 3. if u brake, the symptoms either subside or disappear What is your answer? what do you think this is? . . .. . . .. .. I'll give you the answer: loose lug nuts. I started using a torque-wrench and this is what I get. I was actually surprised how little torque it took to get it to spec which was 76ft-lbs. (For 2007 Corolla.) Now I realize that the wrench is probably out of calibration. I had the wrench in the closet for over 7 years never having used it. I decided to do things by the book after replacing rotors, calipers, pads in a complete overhaul. I used to over tighten, and now it seems, I've been under tightening. To compensate, I have it set now to 95 just based on "feel."