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9A is 16V engine - so the part numbers should be in the picture above.

Could be the above - listed as a warm air deflector plate....?

Is it on a VR6 or a G60 - it just looks like a heat shield to me - I don't think the airbox would be getting any intake from there - that comes from behind the driver's side headlight. VW Classic Parts often have these kind of odd bits still left in stock, so you could try there.

Idle is really controlled by the ECU along with inputs from all the other sensors - MAF, crank, lambda, cam and ISV and throttle position, a vac leak would usually cause a high idle I think. Even though it's OBD1, you will still get lots of useful info, both in terms of fault codes, if any, and real time stats on what the ECU is seeing. You can also initiate an ECU reset procedure that puts it back into initial learning mode using the software, so I would recommend getting it scanned. Checking all leads and the distributor (92 should be dizzy rather than coil pacl) and the coil would also be a good start.

It's pretty normal if the dash has been out of the car for a long time - it's kind of held in place and supported when fitted, so I haven't seen it happen inside the car unless it gets very wet. You could try a light spray of water out of a mister and then gentle hear from a hairdryer and see if you can get it back into shape maybe?

Essentially the brake system from a Mk2 Golf or equivalent, I would think. Probably brake pedal, servo, master cylinder and all the needed pipes. There were plenty of non-ABS Corrados, so you might even find a donor car. Just a warning though, you are unlikely to get a huge improvement in brake performance and feed, the main advantage is no more ABS light woes.

Can't see a black wire - the lambda sensors come in different versions with different wiring connectors, so it looks like someone may have just bodged one to wire it up to the existing loom - if it was original the colours to the connector would definitely be the same. I'd say just match the broken one to the loose one and you should be ok.

Looks great - I'd recommend the 70mm splitter from Spoonfed Tuning - it's a good compromise and still gives an agressive look to the front end compared to the 50mm, which can look a little bit too skinny unless the car is very lowered.

The fuel pump relay needs to see a signal from the ECU relay with ignition on to let it know that the engine is running - maybe it is not seeing this? It is there as a safety feature to cut off the pump. When you bridge the fuel pump contacts you are bypassing this. The VR6 engines don't prime for a couple of seconds the way the Golf 1.8 etc do, the pummp will only run when the engine is cranking or turning over. I would check ignition switch, ECU relay and fuel pump relay.

The 2 x round VDO style gauge panel insert will only fit the early dash if it is the genuine VAG item. I think part of the console trim might need to come out for it to fit, and they are LHD and RHD specific. The only factory gauge option for the latter cars is the complete insert unit with the two integrated gauges and the Corrado script - these are handed too. There's a good few aftermarket 2 hole panels about for both early and late style dashes - think you can even find some 3D print models online.

Actually for VR6 it only lists one radiator part#, 535121251E - I was lookng at the 4 cyl engines, which have different radiators for for standard vs a/c and automatic - 675mm as opposed to 430mm, the VR one is listed 630mm - but it does show some mounting hardware and brackets are specific to auto cars, but you should have them already.

Pretty sure they are different - they tend to be for most models. ETKA lists different ones for auto vs manual, but I've never had two side by side to compare. Hopefully someone else on here will be able to confirm

The video appears to be private - so is sadly not availableany more. You can remove most any immobiliser by following the wiring from the control unit to find where it has been spliced into the vehicle's loom, and then remove the splice and join the original wires up again. This principle should work for any immobiliser that is inserted into the ignition/fule pump wiring.

I think you'll find that the majority of "guests" are spammers and bots. There is a small team of site moderators, but these are not site admins - they mainly to caretaker work on the forum, such as banning users, deleting dodgy content and scams and approving new posts.

Seal is worth a shot, but the flanges tend to crack and deform over time, especially with the heat in the engine bay. Also if the bolts are done up too tight it warps the flange faces and won't seal properly - you could try a little bit of sealant to see if it helps. I've usually just replaces the whole elbow and seal. There are also billet versions of the elbow, but pricey. It's a stupid design really where a single bend on a pipe would have worked just as well. Maybe it was to with flushing the radiator, or being able to swap it out without undoing the hose, but I've never understood it.