So I had to replace the engine in my 2006 F150 due to a spun bearing and busted timing chain guide. Due to the misfires and poor running condition I am getting P0420 code and the truck has a rough idle with the replacement engine and the shop says most likely the cat is clogged or getting there. So which aftermarket cat would work for my application? It's a 5.4 4x4 and I wanna do this as affordable as possible cause I don't plan on keeping this truck for more than another year. I know there are universal weld in cats with the bung for the O2 sensor in the cat itself but I've seen a lot of part numbers being thrown around and I'm just to damn tired to look.

 

These are the correct Magnaflow cats for a clamp/weld-on replacement, assuming your truck has one cat per side. They're the same for left and right, so you'd just need a pair of them.

http://www.realtruck.com/magnaflow-s...ers/51355.html

 

Thanks for the reply. Is magnaflow the only option? Don't know if there are others out there or not.

 

Catco, Bassani, Flowmaster, Walker, there are a few catalytic companies out there. Magnaflow is just most preferred as far as price.