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Old 07-16-2015, 01:17 PM   #1
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Emissions Testing with dual pipes

Where I live, emissions testing is not mandatory. I am moving to Denver within a month. While living in Denver, I will have to pass emissions tests. I wanted to true dual pipe my mustang before moving, but will dual piping it cause it to fail emissions tests if I leave my catalytic converters on? Thanks in advance

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Old 07-17-2015, 03:47 AM   #2
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My car is true dual and passes emissions. I live in NC where emissions tests are required as well. Leave the cats on and you should be fine.

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Old 07-17-2015, 04:29 AM   #3

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it shouldn't fail if it's running good and you have cats. This is assuming sniffer tests...in CT we went to tests involving hooking a scanner up to the OBD port and checking the various sensors with that.
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Old 07-31-2015, 05:48 AM   #4
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In some jurisdictions that do emissions testing, there is a VISUAL component to the testing, so that even if your stuff passes the sniffer, if you run true dual on a car originally certified with a single system, they still won't pass it.

I don't know whether Denver is that anal or not.

California was a major pain in the arse in that regard. Hopefully, Denver isn't.
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Old 08-03-2015, 05:34 PM   #5
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Denver is really lazy with their emissions tests. Every time I've emissioned my car I never once saw them look under the car to check for cats. There is a local guy that passed with long tubes and a factory midpipe that had quite obviously been modified to fit. I highly doubt the testers will know enough about these cars to fail you for having true duals. As long as you still have cats and pass their test then they don't really care.
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