Welcome to the forum
First off the SVT was only made 02-04 no other years produce. Second I'm assuming you have a normal zetec? You can find out just by popping the hood, it should say right there on top of the motor what it is. My yeller' focus clogged it's cat up and was very slow due to it. Just flooring it to keep up with traffic. I did hollow it out and it was a pain in the butt to do so. You probably would be better off getting another one or replacing it all together with a aftermarket header which would get rid of it all together. Magnaflow makes a direct replacement cat if you choose to go that route. Most of us just upgrade to the header and dump the cat all together.