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If they are aftermarket you may need to do O2 Foolers like I had to do with my High Flow Cats. Read this link I gave you. https://wranglerjkforum.net/posts/465126/

Were the new Cats OEM if not then that would be throwing a code, or is it just one side doing the code. What Brand of O2's were used? Was there a ECM reset done?

It's the best fix for your problem, delete the TPMS and check the tires on a regular schedule. That's just another one of the JK's normal electrical issues.

I'm not really sure it's better for cold starts, but they do say you can get better mileage from using it. I like to add a little Lucas Oil Additive to my oil so that it makes it kinda sticky.

It's probably those junk battery clamps, but just wanted to let you know about some other things that can do the no start.

Is the JK a Auto or Manual trans? If it's a Auto the shift cable ends could be bad and it's not going into Park so that the system knows it's in Park. Have you tried to start it in Neutral? Or tried to wiggle the shifter around while trying to start it? Is there a little red dot on in the...

Not sure if this is your fix but most electrical problems are caused buy dirty, missing grounds.

Can you give us a picture of your drag link?

I don't know but his Mechanic says he needs a different one.

Yes a adjustable front and rear track bar will be needed to center the axles up under the Jeep and a adjustable drag link to center the steering wheel. If your steering wheel isn't centered your ESP light will come on and your Jeep will think your sliding on snow or ice and do it's thing.

I don't know if there's a fuse but just wandering what Brand of O2's you used? These JK's are pretty picky on the electronic parts that are used on them.

Have you checked here? https://baseline4x4.com/

Your enhancing the peppier is all.

Yes it does make it move faster then not having one, I have a Pedal Commander. But like you and others have said if you really want performance then a different engine or gears would also help.

Have you ever driven a Jeep with a throttle pedal enhancer?

It could be that you have to much on the switch if you have all those lights on the switch, it could be the Factory Relay if they are run off of one. Maybe add another relay for the light bar from the power wire to it if they are all on the same one.

https://wranglerjkforum.net/threads/how-do-i-determine-how-much-lift-my-jeep-wrangler-jk-has.27206/

Doing a Compression check would be your choice to do if you find out there wasn't a air pocket in the engine causing it to run hot.

No that's not going to fix the leak but it will let you know if a air pocket is your issue. I and others have had good luck with K-Seal radiator leak, your only other choice would be a headgasket.

Did the cooling system get really low and maybe trapped a air pocket in the block? Maybe try jacking the front of the Jeep up about 6" and take the radiator cap off then idle the engine with the radiator full, watch for coolant to drop and add some more to it.