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Discussion Starter · #1 ·
I have to get my exhaust worked on for the 3rd time since having an aftermarket set up put on my truck and I'm thinking about removing the cats. I have read a few threads on here about it but still have some questions. I know you have to have an O2 simulator, and i see people talking about a URD sim, but what is this? Google turns up no results. Also, does removing the cats have any negative effect on mpg?
 
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