I've been getting a strange metallic grating/vibration type noise coming from the rear somewhere.

Seems like it's gradually getting worse.

It's not mega loud but you can hear it most when revving at 2-3000rpm even at a standstill.

Wondered if it could be the gearbox but the oil level is fine and all gear changes feel good with no crunching.

Could it be exhaust-related? Any ideas peeps?

Thanks.
