There are a hand full but most remove the CAT and require a MIL eliminator. If you dont have any emissions then its not that bad... but if you do then you cant really do that. The SVT header is really not that hard. Hundreds of people on here have done the swap, and there are lots of write ups and how too's.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)