eco-charged

Does anyone know if offroad downpipes will make me fail emissions? I am looking to get a stainless works cat bsck and the downpipes. I think the offroads sound the best but I live in a hippie state that tests for emissions

scap99

Offroad usually means catless. You will absolutely fail visual and pop a CEL with no cats.

You can get Catted DP's that are 49 state legal.
But that doesn't automatically mean you'll pass.

lariut

The answer is you will fail emissions if you live in California. You will fail the visual test, dyno test, and electronic computer test.

And tampering with federal emissions equipment (cats) can get you in big trouble no matter which state you live in

eco-charged

I live in CO. I've gotten tests done before on vehicles and I don't think there was any visual inspection. I just got on a dyno and they took readings. That's too bad because these downpipes seem pretty cool. If they were easily interchangeable I would just remove them once a year but that's not the case

lariut

It's not too bad to swap them if you know how to turn a wrench. Couple hours start to finish taking your time. Or just get the catted version if you don't want to deal with the hassle.

eco-charged

Isn't the catted version what I already have on the truck?

scap99

Yes. But they are options out there that flow better and don't have the restrictions that the factory pipes have.

13'TwinScrew

If you just have OBD-2 testing you can get a tune and turn off the rear o2 sensors, which will then enable you to pass.

lariut

Not necessarily. They can turn the check engine light off / prevent the code from turning the light on with a tuner but the emissions system check will still show incomplete on the scanner beyond the basic check for codes most people do. Some smog techs don't care some will fail you for it.

eco-charged

It sounds like my best option would be to talk to our emissions office here in Denver and see what they say.