I've been enjoying the hot weather in UK by using my 2.5L Z4 with the top down as much as possible, and its been fantastic. However recently there has been a metallic rattling noise coming from what I believe is the passenger side (left side in UK), and it seems to be getting worse. I notice it most going over bumps in the road, and it sounds like something is loose under the car. I have had car up on the ramps and have only noted that the exhaust shield in one location is loose, so extra fasteners have been applied. But the noise is still there. Next is taking off the underside trim, which looks daunting, to see if there is anything obvious and visible that way.
So my question is has anyone else had an issue similar to this, and if so what was the issue / fix applied.
Any help welcomed here.