ur best of talking to people around there or calling around or doing an internet search otherwise u have these options:
1. do nothing (usually not a good idea)
2. if you know what ur doing, do it yourself
3. find an audi/vw dealer and have them do it (will be expensive, but hopefully done well and right the first time)
4. find a Midas or other chain auto repair (less expensive than dealer, but not as specialized and will more often than not try to sell you sometime u may or may not need at that given time)