Info below as posted by Jfenley which I've made into a post of its own and FAQ'd....thanks for the post Jfenley.
This is the service manual for your vehicle and the information is located in it.
Here are the instructions
First remove all the screws to the "under tray"
Now bag those loose bolts and remove the tray
Next remove the "Wheel Arch Liner" bolt
Located just inside, toward the front, is a bolt that holds the bumper on the side. Un bolt this one bolt.
If you want to Completely remove the bumper Disconnect the Head Lamp wiring harness
If you are equipped with Head Lamp Washers then also disconnect
Move the washer forward
Removing the Washer
NOW for the final bolts and removal
Pop side loose
This is very easy to remove. Try not to "Flex" the bumper too much or you will end up causing minor flaws in the clear coat and it will later begin to chip off or peel up.
I do not bother removing the wheel arch liner. I gently flex it out enough to get my hand and wrench to the side capturing bolt. There are two bolts in this area, be sure to un-screw the correct bolt.
NOTE: This is how I remove my bumper. JTIS will do it a little differently.
A day without sunshine, is like, well, NIGHT! Nothing is foolproof to a sufficiently talented fool!! A fine is a tax for doing wrong, A tax is a fine for doing well......
MY2007 Audi A6 3.0 Tdi SE Quattro 176bhp Stratos Blue, Front & Rear park assist, Comms Pack High, Sline grille badge, 19" 7 twin spoke RS4 alloys, Rear tints, Dipped bulbs 80W, Mainbeams 100W, Foglights 100W, Number plate bulb LED's, Interior bulb LED's, First Aid Kit, Bootliner, Mudflaps front & rear, Calipers & hubs painted. MY2004 VW Passat 1.9 Tdi Highline LANG MAY YER LUM REEK