the ford F250 we use at work for personal **** wouldn't pass emissions and the boss didn't want to pay the dealer $1200 to replace the cat so I threw in a $45 ebay cat and ran it through emissions today, dropped the CO down to half of what it was before, still not squeeky clean but passed at around 11.2 when the limit is 12 something so I'm happy.
I ended up not even clamping it, it fit tight enough I just left it hanging there
bottom line for the company
1 cat, 45 bucks
1 emissions retest, 25 bucks
2 sawzall blades, 6 bucks
2 exhaust clamps I didn't use, 25 bucks.
not a bad deal
the stock ford cat is some overpriced monstrosity ******* thing, one end is a square flange the other a round. I cut the pipe about 2" downstream from the round end and just left it in place. Cheapest direct fit I could find was like $300 online. I might take some metal screws and just screw through the pipe and the cat to make sure it doesn't shift but probably not