today's update.
Ready for the run to the local exhaust shop, primer grey bonnet and bumper black scoop. Interesting combo.

was enjoying myself too much with the open exhaust (I've clamped the centre-pipe on for now, so its open at the diff) and gobs of torque when I noticed the temp gauge -- whoa! pull over quick! The bottom hose was cold to the touch as if the thermostat hadn't opened.
Let it idle a while and it came down a little (3/4), then I babied her home with thoughts of draining the coolant and pulling the thermostat out. Left it to sit and there was lots of gurgling and slurping - air in the system. I gave the hoses a big squeeze a few times and when she cooled a bit she sucked up all in the reservoir bottle - so I kept topping it up, then re-filled the header tank. This turbo cooling system is new to me.
Second try up to the exhaust shop and it behaved itself. Will be going in there in the morning for a hack to the H6 center pipe (extend it a couple of inches - not sure why its short, maybe the dumps have been hacked, or the centre-pipe for the TT is a different length), make the flanges line up, remove the short constrictions at the ends) and add a diffback.
A couple of other things I noticed on the drive
- AC was blowing hot and wouldn't switch from full facial. I thought it was because I'd forgotten to swap over the HVAC units, but when I did that, had the same problem - turns out I'd left something unplugged in the footwell. All fixed
- Low-range gearbox is popping out of high range sometimes when I coast or compression brake. Not sure why its doing that now - I think I must have un-adjusted the cable in my attempts to make it shift into low range better than it used to.
- new rebuilt shift knuckle and short shift is awesome.
Got back and fiddled a bit more..
- I can't for the life of me find the power window circuit breaker. I've bodged it for now by plugging a piece of wire across the plug where the circuit breaker should go and the windows work fine.
- As many have suggested, the airbag light was the big plug in the driver's right footwell. It has a green tab that needs to be pushed back into the plug. Yay!
- steering light lit up on my drive - but fluid was low after it bled itself - I guess I didn't do enough full lock turns to bleed it the first time.
- HID levellers and RH parker still out. That parker has me stumped. Fogs work fine, so I haven't swapped the wires. I'll need to do some more digging through wiring and get the multimeter out.
- It was a mistake wiring the vanity mirror lights to the interior spot. I had (stupidly) assumed that the spot would be on Acc, but its not. Its full time. So there's a risk that the vanity light will come on and run the battery flat. Vanity will do that to you.