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I asked several 4x4 places around here and looked on-line and was told that you only use a 5" for rigs over 400 hp or so..The hp may be different,but the idea was that,for some reason,the 7.3L only should have a 4",unless it's REALLY jacked up in hp.
Thanks guys I appreciate it. I have some kind of exhaust on it now will try to get a picture, of it. It is pretty big but not sure, what size. It is not a full system though just muffler and tail pipe, hooked in to stock and out the back. But it is a good bit bigger than stock. What is stock size.