After my suspension install the mid-pipe on my MPPSK was slightly hitting a cross-bar causing an intermittent rattle. Took it back in, they re-clocked the mid-pipe and it cleared right up. You could take a look under there yourself and see if the mid-pipe, or something else, is contacting anything. But since you just picked it up, might as well bring it back in, should be an easy fix.
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