Very informative post.99% of aftermarket cats won't set the readiness monitor either. People buy high flow cats thinking they will get them through emissions and they won't. Go back to stock 02 settings in the tune and try using 02 spacers for the rear 02 sensors, they will push the 02 sensors out of the exhaust stream. Even this may not work, but it's the easiest and most likely fix besides putting your stock midpipe back on (removing your headers, which is a pain). These newer cars are ridiculous when it comes to passing emissions and achieving OBD2 Readiness. Some tuners may have figured this out (or hex edited the file for additional capabilities), but I have never been able to confirm how. This is not a tune with stock 02 settings, but one that has been manipulated to make the car achieve 02 readiness. Ask your tuner if they have a tune to pass emissions, not likely, but worth a shot. All of these suggestions are of course for off road use, because we all know that no one would dare disable or remove emissions equipment, because it's illegal.
That's why I said 99%, maybe I should have said 95% in hindsight. Kooks is the best of the best and are the only ones who guarantee that their cats will pass. Even then, there are cars with those cats that do not show ready, even kooks has admitted this. I applaud them for being the only company trying to do this.Run LT's and " green " catted X pipes with stock mufflers on both cars. ( Kooks )
My 2011 has passed N.J. state inspection twice, 2014 & 2016.
.................( my 14 isn't due yet )
In N.J. they plug into OBDII port to verify everything is enabled, there is no tail pipe sniffer used anymore.