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I don't know if my noise was the same as yours because I stopped it months ago.
My noise was caused by two rings on the exhaust pipe between the catalytic converter and the exhaust manifold (or at least somewhere around there, it has been a while since I did it). These rings I think were part of the flex pipe at one time but broke off from corrosion and vibration. I ended up cutting them off with a grinder, but if you don't have one a hack saw will make an easy job of it.
Other than that the other thing I'm thinking of is the sway bar links. They would be more of a rattle probably but they are a part that can wear and become loose enough to rattle.
But if your mechanic checked it out (including a test drive to hear the noise you mean) then there is no noise and you are imagining it. Seek medical attention as soon as possible.
Just kidding. This kind of stuff is tricky and could be as simple as a loose bolt in an area that nobody thinks to look.
One last thing, not very likely but easy to check. Gently tap the catalytic converter (with a solid object like a hammer) to see if the insides have come lose. Do not smash it, just enough to make it move as if you hit a bump, it that is causing your noise you will hear it with little effort.
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Joel B --Here is a bit about me if you are curious http://www.nissanforums.com/new-memb...ml#post1203588
1998 Altima SE 2.4L 5 222 000 Original Km "Bone Stock" 91 Octane
Nissan Publication # SM8E-0L30U0
Always check specs and procedures against actual manuals
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