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Check the bar to make sure a locator ring hasn't slipped. The Muranos have press-fitted ones, like most late model Nissans. Even 1/4" of slop can let the bar move side-to-side in the bushings and cause a noise. The rings should be tucked close to the bushings on both sides. Also check that the subframe bolts and the bolts on the gussets to the rear of the subframe are tight.
 

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That sounds more like rack bushings than sway bar, or possibly it's a "tight" chassis. I'd recommend you try you try what the engineers call "chassis relaxation", since re-torqueing the rack bushings would be part of it. Cars these days are built and aligned "wheels up" on the assembly line, and when they go wheels down coming off the line, the entire frame becomes "pulled" outboard and stressed by the attached hardware. This is usually fine, but sometimes tiny misalignments can result in bizarre noises that are hard to find. The solution is to put the car wheels down on an alignment rack (not a lift, since that would be the same "wheels up" position that caused the problem) and loosen the rack bolts, subframe bolts, gusset bolts, and control arm bolts with the weight of the car on them. This allows the chassis to "relax" to a minimum-stress state when loaded. You then re-torque everything and do an alignment. I've seen this resolve any number of "mystery noises" over the years.
 
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