Those "shorty" headers have been found to do very little in any gains. Be prepared for a very loud exhaust if you are running with very little back pressure / muffler in the rest of the exhaust. Why are/do you want to pull the CAT?
The companies that do make an off road pipe usually expect a full length header. Pulling the CAT alone will not make nearly as much performance as pairing the off road pipe with a good header
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)