Thanks for all your suggestions.

Slowmoe, the valves were last adjusted 3 months ago and at that same time, the timing chain was checked and my mechanic said that there's no stretch.

Also, my air filter housing mount is fine. I check this often as I know from comments here that a broken air filter mount is often the source of vibrations and noise. On a side note, if any of you guys purchased yours from a MBZ independent shop, and it broke on you, don't go out and buy a new one; they should replace a new air filter mount for free as it will be under warranty. Not sure how long it's good for, but mine broke 9 months after I purchased it and my mechanic gave me a new one.

Back to the new noise problem. The new noise was not there prior to changing the engine mounts and engine shocks but is there now. So, I kinda agree with Ken's advice to go ahead and change the transmission mount as I believe that the engine is raised slightly higher now because of putting in the engine mounts and the transmission is a bit lower. I think the engine & transmission is out of alignment and that is creating the new noise I am hearing. This is just my thoughts, I could be wrong.

Aaron, I'll also replace the rack dampener bolt, a good idea, since the last time I replace it was about 1.5 years ago.

Regards,