ok i have a 99 tl i just install new motor mount and i also install tokico with tein h springs ok i always had a noise like thud thud and the car use to have a little vibration know i just install all of this and the car still has the thud thud noise and the vibration went away i dont really know what else to do it drives me crazy hearing this when i go over a bump or hit a pothole its not easy

 

It could be a ball joint, or one of the other 4 motor mounts, or it could be a radius rod bushing or a swaybar endlink.