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First you have mods and no idea what they did probably a nutter bypass which takes out most all vacuum and the computer by cutting and splicing wires. Since it ois just a tailpipe test see if you can go to the site and see if the technician is required to inspect all original emission equipment installed. Here in Nevada it is so.

Go to google and put in YJ Nutter Bypass there is many threads to read which will explain and lead you to identify what has been done. And use this site to understand your emissions test and also go to the Colorodo site and check and see if you can find what they inspect for. With a good tuneup and solid exhaust even with the Nutter you can pass the tailpipe test many owners here on the forum have done so.

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