The propshafts used on the Audi's are both two piece so it's difficult to say as the only difference on a haldex A3 between the two shafts is the type of center joint used.
Audi don't supply a separate coupling for the later shaft and state that it must be changed as a complete unit but the...
http://www.wilsonautotrade.co.uk/used-cars/audi-s3-2-0-tfsi-quattro-3dr-darlington-201511218895508
Noticed my old S3 finally sold and wondered if anyone on here bought it?
If its a constant sucking noise which stops when you press the pedal then the brake servo is leaking. Its not mega common but has happened to a few people, major task to replace it due to the location of it in the engine bay.
Audi but you need to tell them a 2007 reg else they'll try to sell you a complete propshaft as you've found, they part is the same on both versions of the shaft. The part number is in post #5 so just get them to order that or from stoke audi.
First thing i'd question is have they bled the clutch properly, if not do it again. Otherwise they've ****ed something up fitting it, play in the input shaft wouldn't cause this and any issue would be present in all gears not just one.
Get them to remove it and check it for stiffness on in/out movement between the two halves, it will be stiff which is what is causing the vibration. You can't tell visually alone.
I would change it anyway as it will be the problem if you are experiencing the vibration at the published points.
For aftermarket ones you definetly do get resistors with the loom plugs. I'll double check but i've got factory fit recaros in mine and I'm 99.9% sure there are no resistors and the side airbags are unchecked in the coding for the airbag computer.
Which mount?
Assuming the drivers side one then body to mount and mount to bracket are 40nm + 90º and the bracket to the block are just 45nm, the angle tightened bolts are stretch bolts so its essential to renew these whenever they are undone.
Not worth doing yourself, it's on fixed price servicing for £79 get them to do it.
Audi won't change the filter on a gen.2 onwards haldex as it isn't on the schedule, the diff oil is seperate.
Take the bolt out of the top suspension link it will allow the hub to come forward enough to be able to get at the bolt. You will need to support the hub though once the bolt is out and they tend to corrode tight nicely but it's the best way i've found yet.
Bear in mind it's a stretch bolt so...
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