you could always crawl under a Ford Econoline van at night with a Sawzall and have yourself a fresh cat in about 10 minutes. At least that seems to be the crime stats in the city nowadays, precious metals inside the cat go for decent money at pawn shops in a recession lol!

In all seriousness, I'd go with what epdarks says, if you can't get a used E53 cat on craigslist/ebay/forums/junkyard, check the exhaust piping and get a Magnaflow or some aftermarket cat to fit on, just get the old cut out and the new one welded on.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards