I tried just the non foulers, and that didn't work, so I made a set of car simulators. Here's my write up, on what I did. They've been on my truck for several years, and work grate.I've seen people run the spark plug non fouler on deleted cats might as well try it on mine since the cat is bad...from the way it sounds it maybe mostly gutted anyways lol
Thread 'remove your cats, and make a mini cat for your rear 02 sensors.' https://www.gmt400.com/threads/remove-your-cats-and-make-a-mini-cat-for-your-rear-02-sensors.30681/