[nofomo]

Over the last few weeks, I noticed that on cold start, once I drive off, increasing RPMs makes a gradual metallic noise in the undercarriage/rear area of my 135is.

I originally thought it was just a rock chip, but that doesn't seem to be the case.

Has anyone encountered this noise before? It tends to go away/not be as prominent after driving for a few minutes. No noise at idle or revving the engine in neutral.

I'm guessing something is loose and rattling?