I am going to put a new exhaust set-up on my 02 5.4 4x4. Im planning to put 2 magnaflo high flow cats most likely 2.5" and a rear o2 delete with my sct livewire with a magnaflow muffler. My question is should I get a cat with a 02 bung directly on it or just put it before the cat

 

Anyone

 

Not sure why anyone would do that really. Is there a purpose ?

Your question doesn't make sense. Are you running headers or something ?

Your deleting your rears ? Why do that ? I don't understand. Do you know what your doing ?

Perhaps you could splain it better ?

 

my cats are leaking terrible. so instead of buying an OEM setup for an aftermarket I was just going to get to high flow cats

 

Your ECU is looking for pre and post cat signals. I'd stick with an O2 sensor before the cat itself if I were you. As far as the rear O2 sensor delete, it's just checking to make sure the cat is doing its job and generally isn't used by the engine to adjust fuel mix etc. Doesn't hurt to have it on.

 

Ok. Thanks. Do you have a suggestion as to what model cat I should use. Im looking for 2.5"