Anyone ever use a 4" or 5" catalytic converter? - Ford Powerstroke Diesel Forum
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Old 07-19-2013, 08:11 AM
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Question Anyone ever use a 4" or 5" catalytic converter?

Please don't let this turn into a heated debate extolling the virtues of running cat-less and how it's better for the truck and the environment and etc. This is just my curiosity more than anything since almost all posts suggest removing the cat.

But anyway, I was wondering if anyone has ever used the 4" or 5" Magnaflow heavy metal catalytic converter? Or ANY 4" or 5" cat for that matter on their 6.0? Did you notice any difference in EGT's or lag or, well, anything?

They are pretty darned spendy and so I'm betting no one has used one.

Thanks!
Shawn
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Old 07-19-2013, 09:17 AM
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same boat here I was looking at a magnaflow stock unit or one of the magnaflow unv diesel 4" units.
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Old 09-30-2013, 06:02 PM
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I just got mine in the mail

I left clorado 2 yrs ago came back and now I have to have a cat on my truck. So I bought one I have not installed yet that will happen this week I will keep Ya'll posted . . ....
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Old 09-30-2013, 06:32 PM
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You probably won't notice much difference in power. Most took them off because of the cost of a larger exhaust system with one. The turbo whistle will seem slightly quieter. You may have slightly less smoke or smell at start and idle.

If you had kept the old one, you could have just cut and welded in a 4" or 5" pipe to the CAT for a less expensive option. That is what I did for mine.
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Old 10-01-2013, 06:06 AM
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We save the 04-07 dodge cats just for that. For our customers that have to be dot'd and want bigger exhaust on therir ford or chev. They are 4" and easy to weld 5 onto. They are big and shouldn't be hard to come by. They don't scrap for much either.
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Old 10-01-2013, 09:20 AM
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Anybody seen the size of the orifices in the magneflow cat ? I heard that they are larger
to decrease back pressure , but it's only second hand information.
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Old 10-02-2013, 10:33 AM
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I've had my 4" magnaflow cat on for a year now. My truck did not have one when I bought it and I got caught last year at emission time. So I used that as my excuse for added my exhaust. It is very open with a cross hatch pattern that runs through it. I'm sure it knocks some of the whistle out of my 03 turbo but not much. I did it all together so I can't really give a before and after but have been satisfied a lot cheaper than a new stock cat.


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Old 10-02-2013, 12:14 PM
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Just wondering

Hey did you weld or clamp the Cat in
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Old 10-02-2013, 12:22 PM
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I have the same Magnaflow Universal Diesel Cat and its weld in....
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Old 10-02-2013, 01:03 PM
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It is recommended to weld the universals in, but I clamped mine, so far so good, my plan was to take it out after inspection but I don't believe it's worth it for me.
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