Do all high flow catalytic converters throw a CEL?

I just changed my exhaust and before I button it up I got to thinking.
If they do, do I tune ECU just to delete cats? Will the Durametric do that?
Raise O2 levels? Will Durametric do that?
Or should I put spacers on the O2 Bungs?

Any insight will be appreciated

 

AFAIK (I tried both high-flow 200cell catts and now cattless).

Durametric cant do anything with regards to changing monitors etc

A tune can turn off the monitors that causes the CELs, but you wont have those monitors passing a inspection if they are strict.

Extenders should solve this regardless of being tuned or not.

My Cobb tune has turned off the secondary O2's I will try to pass inspection like this, if not I have the FVD extenders (O2 simulators) ready to go on.

Neither works if they actually do a smog test

 

I'll try the extenders first before I even test the exhaust out on the road.

Does any one know if the CEL would come on the first time I start or does the car have to warm up and be driven for a while?

 

Cel could show up a year later, many variables. Consider a europipe, they don't throw codes. My old car graphic threw post cat codes so I moved to a europipe.

 

Guess it depends on your catts, for me once cleared they came back next day.

 

Just for reference and your results may vary, I had my tuner turn off the post cat o2 sensors while I was running a cargraphic exhaust. Fast forward a few years and it still passed the CA Smog test with no issues at all (with europipe now installed but sensors unchanged).


It is not just the cat itself that, its the design / size of the cat housing and the placement of the o2 sensor after the cat which all can lead to codes or no codes. So even if the exhaust uses the same cat base one exhaust could trigger a code while the other may not. Fun stuff.


I highly preach on here to just go europipe and save yourself any potential headache.

 

If I had the dough, I would've gone with Europipe however I got what I got and trying to work with it.

 

I would guess tubi is also good as Champion is only selling them. I found out like others, the cel doesn't necessarily come on for a while. My kline threw the post cat sensor cel, but only after about 4000 miles. You can't tell if you are good or not! And then once you get the cel, you clear it and it comes back quickly. At that point you really get stuck; either go back to stock, get a tune, or change exhaust.

 

Mine do not and they are HJS 100 cell with a 580 tune. I threw a CEL warning a few weeks ago but reset the code and it hasn't come back

 

How many miles has it been? 100 cell cats are going to be tough. You have a tune? Did it eliminate the post cat O2 sensor? I guess not, if you got a CEL. Give it 1000 miles, it will probably come back on.

 

it's been a good 500-600 miles. Yes I have a stage 1 tune +100hp. Still all clear

 

I have a Agency Power Titanium, 200 cells and extenders and my CEL came on after 20 miles. If I reset it will be back on in 2 miles now. I guess a tune will be next.