SPD catted downpipes, check engine light

[Nafod]

I had SPD catted downpipes installed a couple thousand miles ago and am getting a check engine light for catalytic converter efficiency below normal. Anyone else have this issue?

 

[CaliRaptor559]

What code you getting? I had P0430 and P0420. I got SPD 02 extenders by Nick from Apollo optics. I’ve had them on now for 6-8 hours and knock on wood no light.

 

[nikhsub1]

I have a p420 with OEM cats. Wondering if it is a bad downstream o2 sensor?

 

['Smith]

Dealership had to replace my CCs at less than 500 mi on my stock '19.

 

[KIMCH3333]

What code you getting? I had P0430 and P0420. I got SPD 02 extenders by Nick from Apollo optics. I’ve had them on now for 6-8 hours and knock on wood no light.

Had to do the same using Kooks green catted downpipes

 

[magaraptor]

I’ve had them on my 2018 for about 45,000 miles and no codes no issues

 

[CaliRaptor559]

Had to do the same using Kooks green catted downpipes

Looks like we have sensitive Cats. So far so goof day 2 on the 02 extenders *knock on wood**.

 

[ruey220]

I’ve had them on my 2018 for about 45,000 miles and no codes no issues

Did you have issues passing smog with these?