Convertor question
Posting Guru
Joined: Apr 2004
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From: Georgia
That will only work on models without the "after-cat O2 sensor". The ones with will throw a code.
Senior User
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Good point, I forgot to mention that. I think the after cat models began in 05' if I remember reading that right. I hope someone else on here with much more knowledge on Superduty's will set me straight if I'm wrong.
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Frmr Ford Trans Engr
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There is no emissions inspection in Michigan.
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Posting Guru
Joined: Nov 2005
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From: Wyandotte, Michigan
I ordered a set of Dynomax duals for it and thought I might rip the cat off while I'm under there. I remember my dad gutted the convertor on his 78 LTD 351M and put it right back on.
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That's odd, I thought the only F250 models to have an after cat o2's were the 05' and up with the new y pipe. My 03' has the o2's on the down pipes from the manifolds and nothing else.
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From: Salt Lake City, Utah
It depends on the weight rating. If the vehicle weighs less than a certain amount the exhaust gets set up differently, and that includes an aft cat O2 sensor. If the vehicle weighs less than that amount it has to pass the same smog certifications as other light vehicles. But if it goes over the weight limit, it qualified for an exemption till '05.
The stock cat is kinda restrictive because they are really too large. Removing them will give you a power boost and better gas mileage, but not as much as if you run the proper cat. We sell a lot of cats on Superduties that have had the cats taken off, and our smaller cat produces a noticeable increase in torque versus a system with no cat. And it flows and sounds a lot better than stock.
The stock cat is kinda restrictive because they are really too large. Removing them will give you a power boost and better gas mileage, but not as much as if you run the proper cat. We sell a lot of cats on Superduties that have had the cats taken off, and our smaller cat produces a noticeable increase in torque versus a system with no cat. And it flows and sounds a lot better than stock.
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