How to pass emissions with catless headers

[David16]

I have a 2016 mustang gt with texas speed long tube headers. I have a CEL due to being catless. Do I need o2 extenders, defoulers, or mini cats? My state doesnt do visual inspection, only OBDII. I need the monitors to be "ready", plus i want to get rid of the light lol.

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[Zrussian13]

Get defoulers to get rid of the code. Your cat monitor may not go green but you can pass an obd2 test with one not ready monitor as long as you have no cel. (In most states)

 

[Dave2013M3]

Get defoulers to get rid of the code. Your cat monitor may not go green but you can pass an obd2 test with one not ready monitor as long as you have no cel. (In most states)

Not with an 02 not ready code. Most states allow one, but not that one.

To the OP, get the defoulers and see if that gets rid of the CEL. If you don't have the CEL that means your readiness codes should be OK. The issue you may run into is if they look under the car. A lot of states are going the Cali route.

 

[Zrussian13]

Not with an 02 not ready code. Most states allow one, but not that one.

To the OP, get the defoulers and see if that gets rid of the CEL. If you don't have the CEL that means your readiness codes should be OK. The issue you may run into is if they look under the car. A lot of states are going the Cali route.

Federal emissions allow one not ready including o2. I cant speak to how most states enforce things but arizona absolutely will pass you as long as there are no cel codes and one monitor, even o2 not ready. I just went through it in another vehicle.

 

[WildHorse]

Do I need o2 extenders, defoulers, or mini cats?

you'll get a CELL with green/hi-flow whatever CATS. Yer best bet is to get the rear o2's out of the exhaust flow. Defoulers would be yer friend here. No guarantees though.

 

[HKusp]

O2 Simulator Mini Cat Cel Fix stainless steel Rear O2 sensor simulator.

 

[ORRadtech]

O2 Simulator Mini Cat Cel Fix stainless steel Rear O2 sensor simulator.

That's interesting. I wonder if there are any advantages to replacing the spacer in mine? The spacer got rid of the code/CEL when I had to go to a higher flow cat. I'm in an emissions area and have passed the last two years without issue. They do do a visual inspection but it's very cursory. Anyway, if either were seen it would probably fail. I'm just wondering if that little device could/would change or improve operation. I haven't noticed any difference or loss from using the spacer so I guess I should just leave it be. Unless???

 

[HN401A]

O2 Simulator Mini Cat Cel Fix stainless steel Rear O2 sensor simulator.

This is the product I use paired with Kooks Green Catted Headers and Corsa Sport. No CELs and passes inspection no problem.

 

[HKusp]

That's interesting. I wonder if there are any advantages to replacing the spacer in mine? The spacer got rid of the code/CEL when I had to go to a higher flow cat. I'm in an emissions area and have passed the last two years without issue. They do do a visual inspection but it's very cursory. Anyway, if either were seen it would probably fail. I'm just wondering if that little device could/would change or improve operation. I haven't noticed any difference or loss from using the spacer so I guess I should just leave it be. Unless???

I would leave it as is. I have these and the "mini cat" portion is an absolute joke. But they got the 02 code to go away.

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