I bought this kit years ago for my C5 A6 and sold my car before I ever tackled the project. Been sitting in my closet ever since. I "believe" it should work for the S4 with the 2.7T, but you should try to verify before buying. Here's a link to the Blauparts page:
http://www.blauparts.com/proddetail....d=GF21002%2D1C

Asking $100 shipped to your door.