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The other day I cut off my back muffler. Right before the back muffler there is another piece to the exhaust, I believe it to be a resonator, but it could be another muffler. My question, what is it? And if I cut it off will it throw a cell?
 

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It will not through a SES. (Service Engine Soon) light. I don't know about the stadard Focus, but on the SVT Focus, thier is a tunned muffler, muffler, resonator, and cat. As long as your cat is on, it will not through a code.
 

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No, you shouldn't have any problems with the car throwing the CEL (check engine light). I am currently running a 4-1 race header, no cat, and Magnaflow catback and I have never gotten a CEL. NO MIL eliminator either.
 
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