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Areddi · 08-18-2012, 08:17 AM

Hi guys,

If you remove the cat in the front-pipe, are you going to throw a code in these cars?

In my Miata there is a second downstream O2 sensor whose job is to basically verify that the CAT is there and working. The the upstream O2 sensor does all of the calculations for air/fuel etc. Therefore, if you remove the CAT, you get a code.

I live in MD so we have and OBD emissions check every 2 years, and I want to avoid codes. I want to get rid of the CAT if I can, I know high-flow is an option, but full removal would be preferred.

Has anyone confirmed whether you'll get a code or not yet?

08-18-2012, 08:17 AM	#1
Areddi Senior Member Join Date: Aug 2012 Drives: Firestorm FR-S Location: Columbia, MD Posts: 573 Thanks: 83 Thanked 190 Times in 133 Posts Mentioned: 19 Post(s) Tagged: 1 Thread(s)	CAT removal in the frontpipe, CEL? Hi guys, If you remove the cat in the front-pipe, are you going to throw a code in these cars? In my Miata there is a second downstream O2 sensor whose job is to basically verify that the CAT is there and working. The the upstream O2 sensor does all of the calculations for air/fuel etc. Therefore, if you remove the CAT, you get a code. I live in MD so we have and OBD emissions check every 2 years, and I want to avoid codes. I want to get rid of the CAT if I can, I know high-flow is an option, but full removal would be preferred. Has anyone confirmed whether you'll get a code or not yet?