You'd be much better off keeping the original Audi axle and just replacing the boot. The original Audi CV joints are nearly indestructible. Much better quality than VW CV joints.
Many service shops have had customers running for well over a year with no issues.
If the joint is not making noise...just clean it, re-grease and install a new boot. You can clean with Brake Clean, and it is easy to see any wera or damage once the CV is clean
Edit: We ( Audizine ) just recently on this same subject. Bottom line was..." Why do you think an OEM Audi axle costs $500...and an Autozone one $69.95 ? ". Ya gets what ya pays for!! Link to thread:
http://www.audizine.com/forum/showthread.php?t=319108
Several shop owners answered and they all agreed that they always tried to re-use the original Audi CV joint, as they were of such high quality.
Boot kits are under $30 with hardware and grease from places like German Auto Parts. I get jobber prices on parts, and an OEM quality boot kit ( Made in Germany ) with hardware and grease cost me $17.
It's a messy job....but not really that hard.
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