Spartacus 68, make sure that you are sitting down!
The individual engine mounts, which are 8R0 199 381 AD and 8R0 199 381 AE were £304.20 each, the mounting plates 8K0 399 059 A and 8K0 399 060 were £29.65 each, so the total parts bill - and I also bought in all 5 bolts associated with each mounting - came to £702.60.
Now, okay my RHS mounting was, as far as I know, just leaking fluid, so I reckon that replacing the mounting plates might not have been needed - ie the mounting(s) had not collapsed and the mounting plates are the final part that the sheared mounting ends up resting on, so would/could end up being damaged, but before my VW Group Indie handed the "required parts list" they had made up to me after TPS could not at the moment, supply the RHS mounting as it was out of stock at Audi Germany, I had already decided that I would have replaced these mounting plates as well as all the bolts - and that VW Group Indie had included mounting plates but no bolts!
So now, I plan to buy in and replace all 8 subframe securing bolts and all 6 lower brace securing bolts as all of them are torque to yield settings according to Audi workshop manual, and Audi recommend "replace". Other bolt I'll probably replace is the steering column clamping bolt - okay cleaning it up and its threaded hole and applying Loctite would probably be good enough, but while I'm at it I'll probably include replacing that bolt, again as Audi recommend.
ARB drop link bolts are not so critical and maybe it will be time to "refresh" all the rubber bits anyway after 13 years in use.
The reason why this becomes such a big job, if done correctly, on the S4 and maybe some other V6 cars is, the oil cooler gets in the way when working on the LHS engine mounting, and on the S4, the AC compressor seems to have, due to space restraints, rigid metal piping for the final pipe runs to the AC compressor, so that means while the oil cooler can get left connected to the coolant system, and just tied up up of the way, the AC system must get de-gassed and the compressor removed completely from the car. Plus, it seems that dropping the subframe is a very good idea if working on both sides.
A 4 wheel re-alignment was included in the 4 hours labour.
Yes, so my car had a very good Christmas, I was amazed or at least initially prepared for this job's total cost to be 50% parts and 50% labour - as it would be if Audi had been given this task!
It is really annoying that the Audi supplier of these engine mountings, Lemsforder do not provide correct parts to the after market, as they do for lesser B8 A4, that would have kept the cost down a lot, ie roughly £100 each instead of £300 each!
Curiously, or something, the Lithuania based seller of VW Group parts, changes £258 each roughly for this version of these engine mountings - but £48 each roughly for the mounting plates!
Finally, sadly my local VW Group Indie, while happy to fit Lemforder or another brand of aftermarket parts, does not seem to want to fit Meyle parts, but that might just be down to Meyle not being available from the motor factors they have accounts with.
Edit:- for me, doing this job myself sort of turned from being possible to being tricky due to me needing to buy/rent a suitable sized/rated engine top support, lifting the car up high enough and then have a means to support the lowered subframe while leaving enough space to work on the car - maybe a cop out on my part, but I ended up reckoning that this was a job for a workshop that did have suitable engine top support, 4 poster lift and something like trans jacks to support the dropped subframe. Even that establish VW Group Indie needed to buy in some tool(s) etc before tackling this job.
