Well another update, checked information with my mechanic relative, and it turns out there were many bits of information I was missing. There's info on the emissions label (photo later, too big to send from my phone) that is crucial to getting the right cats. It turns out the Jeep is a Factory California spec vehicle that applies to Tier 2 standards. As it's the info on the sticker it has to match to avoid a $10,000 fine as the mechanic said. The issue is the specific cats required in that case is now over $500 a side (for the universals!), and just going out of state to buy federal spec ones will not work due to it being factory California emissions. *Really* hoping he's able to weld the y pipe back together now else it'll be off the road another year.