YES!

Check this:

http://my350z.com/forum/tuning/51824...vs-tuning.html

Good to know. But how can the codes be disabled?

Uprev Osiris can disable catalyst codes if you have them. However disabled codes will fail emissions in some states like mine. So...... yank those non foulers off once you get through emissions.

good to know, but i woulda done like you said. just had them for the testing and pulled them back off once you passed. its obv they hinder the tune, i wonder how they affect stock cars with TPs/HFCs. i never really checked and monitored it when i had my MR v2 TPs on. good post tho!

Will it be ok if there were no codes to disable? I have Osiris I'm not sure if they disabled catalyst codes or not. I assume u mean if codes should be showing up you will fail.

If any emissions related codes are 'disabled' usually means automatic fail on OBD2 emission tests even if you're not triggering the codes. I guess it comes up as 'not ready' so they tell you to drive your car some more and come back...

Damn I am going to be taking the non foulers off tonight. Great info

Do ART pipes have non-foulers?

Unfortunately they are built into the art pipes (permanent) from what I can see.

I keep getting rear O2 sensor codes since my retune I wonder if that is the problem.

PM me when you think we can do the switch in my car. I will be out of town until weds.

Which codes? If they are catalyst codes they are harmless... if they are range codes then you have a problem... when I had all my issues leading up to the thread I wasn't even throwing any codes.

voltage codes