u/Inevitable-Stage9347

While I’m oversees working my dad took my ‘96 7.3 to get emissions testing in Arizona. Failed due to not having a cat as the previous owner decided to straight pipe it. Looks like 4” downpipe back.

Am I correct in assuming I need to get a 3” universal cat then weld on a flange to mate to the downpipe? I’ll be back in a few days and I’m planning to go with an aftermarket 3” downpipe and get rid of the stock pancake one.

In addition if anyone has knowledge on getting a suitable stock cat if this doesn’t fit, that would be great. Trying to find any schematics on stock parts has proven impossible.