<ul><li><a href="http://cgi.ebay.com/ebaymotors/PAINTED-2006-Audi-A4-S4-RS4-Trunk-Lip-Spoiler-WHITE_W0QQcmdZViewItemQQcategoryZ33638QQitemZ80424 46046QQrdZ1">trunk lip spoiler</a></li></ul>

but I really like the look. If price includes factory paint match, its almost too good to be true. I purchased a similar unpainted one for my last car ,G35X, for about $40 on ebay and had a buddy with a body shop paint it. I was very happy with it. As there is a minimum amount of paint a body shop must mix, the ebayer's claim of cost to paint is accurate. The key is that they include plenty of "flex" in the paint process- so it won't blister when installed. The poly material of the spoiler will flex with the contour of the trunk when installing. You have to prep the trunk by rubbing alcohol to remove wax so adhesive tape will adhere.
Hopefully someone here may have experience with this specific item/seller. You may have stumbled upon a nice deal here.

keep in mind with the install, you only get one shot. While I have faith in you, you could always swing by a local body shop and let them slap it on. They tend to have experience with such things, as side moldings often go on the same way. As I recall, measure first, then get the spoiler started on one side, and peel the tape membrane off as you work your way to the other side...in other words, don't peel all the tape at once then try to stick the thing on.
Good Luck. I'm anxious to hear the results (particularly due to the color of your car).

<center><img src="http://www.ecstuning.com/stage/images/product/iadmin/3652_x600.jpg"></center><p>but for the price, you can't beat it. Let us know what you think.

you want to make sure that the adhesive activates properly- but you probably already realized this.
(I wish AW sigs made it easier to see where people resided)

I'll probably have to borrow someone's garage.