Anybody install high flow (200 cell vs stock 400 cell) catalytic converters and have CEL problems? My stock units have 110k miles on them and I occasionally get a code. The O2 sensors are new.

 

I put on FabSpeed 200 cell last May, and have put on over 8,000 miles with no check engine at all. Very happy with them.

 

I have the Fabspeeds 200 CEL cats as well. They're great. I don't know what the emissions testing process is in TX, but I had to put the stock cats back on to pass in CA.

 

i'm running GT3 200 cell ones, so far so good

 

Was it emmission reading or visual that forced you to put the stock cats back in for testing?

 

The emissions reading for the low RPM test was just slightly out of range--no visual issues. It was suggested that I should've gone out and really heated them up before coming in for the test the first time. I'll try that next time, but try to find a "pass or don't pay" place as I had to pay for the retest.