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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