That's weird because on my car (1998 2.5 Duratec, CD4E) the TC was the code C from the factory. So i dont know maybe they changed it later on...contour/mystique was killed off in 2000.

Here's some of the specs:
http://www.bulkpart.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=2&Category_Code=CD4Etc


Maybe the cougar message boads would have more info?:

http://www.newcougar.org/forums/index.php

1998 Mystique LS: -2.5 Duratec ATX -Vibrant White -------------------- =Pics= =Info=