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Catalytic Converter

529 Views 9 Replies 6 Participants Last post by  PowerStrokeMeF450
My 99 F350 with an automatic in Oregon , and my friends 2002 @ least I believe it to be that year did not come with a catholic converter in those years .. Gov Holmes
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my 02 don't have a Cadillac Converter either.
Here is what I have saved as far as cats on 99+ years of Powerstrokes:

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OK, but earlier 6spds were 250hp and had converters.
So what's up with that?

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Not exactly true. There were no '99-up stick shifters with 250 HP.

All "early" '99s had a cat.

None of the '99.5 thru Y2Ks had a cat, and they all had 235 HP.

One confuser is the International sticker on the engine of some 7.3Ls said 250 HP, but the Ford sticker on the same engine said 235 HP. International designed that engine so it could have a max of 250 HP with International tuning (computer), but Ford didn't use that tuning and installed a Ford computer (PCM) which resulted in 235 HP. So if you have a '99 thru 2001 7.3L stick shifter that you think had 250 factory HP, you are in error. /ubbthreads/images/graemlins/blush.gif

In 2001 model year, none of the automatics had a cat, and all the automatics had 250 HP. "Early" 2001s with stick shift had 235 HP and didn't have a cat.

Later in the 2001 model year, the stick shifters were bumped up to 275 HP and added a cat.

For 2002 and 2003 model years, none of the 7.3L automatics had a cat, and all the stick shifters had a cat.


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Looks to me like ALL 6spds had them regardless of hp rating.

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Nope. All early 99's had a cat. '99.5-up 7.3L stick shifters with 235 HP didn't have a cat. 2001-up 7.3L stick shifters with 275 HP all had a cat.

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Only a few Autos got them, I'm guessing from state emmission requirements (Cal. isn't the only one with tighter restrictions)

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California emissions had nothing to do with cats on '99-up 7.3L PSDs. All early '99s had a cat. Nothing assembled after December 1998 with an automatic and a 7.3L PSD had a cat.

All 6.0L PSds have a factory catalytic converter.
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As I remember the 97 era trucks exhaust pipe in front of firewall is smaller in diameter and the wall needs to be bent in to enlarge the exhaust pipe . The system needs help as the 99 era was upgraded . There might be a problem there that were not aware of ? Keep us posted , were interested , good luck . A privet muffler shop might provide a downpipe that would help ? Gov Holmes
the 94 to 97 powerstroke did indeed have a "flattened" downpipe to help with firewall clearance.
with very minor firewall massaging a 3 inch downpipe will bolt rite up.
Neither my 99 nor my 00 had catalytic converters. Perhaps the gas engines did?
Neither my 99 nor my 00 had catalytic converters. Perhaps the gas engines did?
What transmission did they have?

Any questions see my above post. It pretty much explains what trucks had them an which ones didn't
Jax 99 is manual, the 2000 is automatic.
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the 94 to 97 powerstroke did indeed have a "flattened" downpipe to help with firewall clearance.
with very minor firewall massaging a 3 inch downpipe will bolt rite up.
My 96 had a flattened pipe and cat, now my shed has the cat. and flattened pipe!
My 02 F450 never had any and is somehow smog exempt and 100% legal in Nazi-fornia. I don't know why, but I love it! Very lucky considering how things are here.
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