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Old 08-27-2020, 07:49 PM   #1
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MD Emissions with UEL catless headers

I'm looking to get a UEL catless headers, but I'm concern that it won't pass the emissions test, Anybody has experience with this topic? would a tune also mess with the emissions test?
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Old 08-31-2020, 10:15 AM   #2
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It's based on OBD so if you remove the header cat, there will be a CEL from the O2 sensor. You can tune the car in such a way that this goes away and throws a "not ready" signal, which in VA you are allowed 1 and can still pass the test. I think this will be the case for MD but I can't verify.

Additionally, as long as you don't remove the front pipe cat, you'll likely pass a visual inspection since the header cat is hidden under a skid plate. Most people aren't going to bother lifting the car and removing that or they won't even know there should be a second cat there.

I would assume you'll probably fail an emissions sniffer test like the VA rapidpass ones.
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Old 02-27-2021, 08:43 PM   #3
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Youíll pass as long as thereís no cel. Just find a decent tuner

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Old 04-27-2021, 08:43 AM   #4
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Same question here.
I just decided to change my registration from NJ to MD.

I got catless header and front pipe. The resonator on my HKS front pipe looks similar to a cat which is kinda tricky in a visual inspection. I have passed the inspection in NJ and PA with this setup and 1 signal ignored because not catless header (CEL has been tuned off).
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than win by an inch because someone else built it for me.
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Last edited by Figo; 04-28-2021 at 10:39 PM.
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Old 04-27-2021, 10:32 AM   #5
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I've always passed as long as I have no CEL (including long term codes that aren't throwing the light atm)
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