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+1 to the above issues already noted.
And also remember the cars OEM computer is programmed to intentionally leave a small amount of unburned fuel in the exhaust in order to be used by the CAT ... unless you change the computer system as well ( much more involved ) ... the car will send this unburned fuel into the exhaust weather there is a CAT or not... at least with a CAT in place that little bit of ICE 'extra' fuel goes to good use by reducing smog emissions like NOx and such ... without the CAT but with the OEM computer system ... that fuel sent for the CAT is just thrown away.
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