well, the tires are new, but check this out. tired and pissed of it, raised the car from the rear and started looking around. the left muffler came kinda lose from the joint w the x-pipe and was hitting against the frame..... so what i did, i losened it a bit more to adjust the muffler and to make it stop hitting the frame. after doing this, i dropped the car, took it for a test drive, and voila! believe or not, the pipe hitting against the frame was making that thing shake like a rattler, and that little vibration from the muffler can actually be multiplied through the frame to make it unbearable! problem fixed! anyways, thought it was necessary to share this w u guys. appreciate the help!
thanks, and keep drivin"!