Think I found out the source of my rattle today.
Drove the car around slow for about half an hour. Notched the rattle starting to happen when I was accelerating. Happens softly in 2nd from 4-5k+ rpms under acceleration and gets louder in 3-4-5th gears.
Made a few passes around the neighborhood pressing/holding various dash parts but no effect.
When I got home I tried revving it while sitting in the driveway and managed to replicate it. Sticking my noggin right down near the centre console and pressing my ear on stuff I traced it to the shifter and not the dash. Sounds likemthe sound isnbeing transmitted tonthe shifter from somewhere else in thebdrivetrain - holding the shifter lever itself or leaving it alone seems to have no effect.
It only happen when the car's hot so I'm guessing that it's something to do with the gear oil or syncros or clutch or flywheel or something.
Should note that my transmission behaves perfectly driving-wise. Shifts as smooth as butter, no trouble getting in or out of gears, no odd behavior atball except for the rattle. Ultimately I don't think it's a serious issue, just an annoying one.
I'll point the dealer at it when I take it in for my 1000k device, see what they say. Hopefully an easy fix.
Point being - the interior acoustics male it tricky to track down rattles when you're driving. In suggest either getting a friend to drive while you check for rattles or vice versa.
Actually pretty glad to have tracked it down