The Febi Bilstein kit looks nice, however I already ordered and received all OEM parts in the kit (except for the balance shaft tensioner and chains, went with Febi) for $415.

Originally Posted by
Smac770
Audi switched to the longer upper and right guides for the cam timing chain starting Jul 1 '13. It would seem logical to just supersede the older guides. But per parts.audiusa.com, the newer ones do not supersede the older ones for vehicles prior to that date. Is there any reason you can't use the newer ones, no idea.
The AN vs AQ is about the upper guide for the balance chain. AN for before May 18 '09; AQ for after May 18 '09. I believe they cannot be physically interchanged. Something about a moved bolt hole.
This is correct, good thing the Febi kit includes both versions of these 3 parts:
Timing Chain Guide (Right)
Before 7/1/13: 06H109469AP
After 7/1/13: 06K109469M
Timing Chain Guide (Upper)
Before 7/1/13: 06H109469T
After 7/1/13: 06K109469N
Balance Shaft Chain Guide
Before 5/18/09: 06H109469AN
After 5/18/09:06H109469AQ

Originally Posted by
Smac770
Is there any reason you can't use the newer ones, no idea.
Great question that needs an answer. I didn't find any other direct timing components that changed with the 7/1/13 VIN split. Maybe something changed with the cams or bridge?
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