you may have seen this link, but maybe not hope it helps, wish i could help you more but i have never installed one, http://www.2gnt.com/index.php?d=SAFC_Installation(pay attention to the note in red about halfway down the write-up...good luck)
'95 rs turbo project'97 gs parts car'01 Audi s4 DD'80 porsche 911 993 widebody, 3.6ltr