Cat and muffler question - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 04-09-2012, 07:19 PM Thread Starter
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Cat and muffler question

So i know that utah requires a muffler if you live in davis county. But what about a cat?

And did my 99 come stock with a cat?

Anyone gut it and still able to pass emisions?

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post #2 of 13 Old 04-10-2012, 04:44 PM
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Yep have to have a cat too. I tried to sneak it by without a cat one time and instant fail. I'm sure it would pass with a gutted cat. I have an EGR delete and it passes.

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post #3 of 13 Old 04-10-2012, 06:25 PM Thread Starter
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cause i wanna do a muffler delete and cat delete with a straight pipe and then bolt it back in when it comes time.


but if i gut it and it doesnt pass do they give you a certain amount of time to fix it or just go straight to the state?

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post #4 of 13 Old 04-10-2012, 06:38 PM
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They told me to put the cat back on and bring it back in.

2005 F350 CC SB ,Turbo-back Silverline 304 ss , RCD EGR delete , Elite VGT-SS turbo , SCT tunes by DJ's , cat delete , Autometer triple gauges , 20" MKW M19 , Toyo 38 x 15.50 x 20 , Icon 4-link 10in. lift , Dual Sway-a-way coilovers and shocks , Pioneer Avic F90BT, OUO Driveline Drop, CCV reroute , FS-2500 oil bypass, Mag-Hytec diff covers , Amp steps


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post #5 of 13 Old 04-10-2012, 08:07 PM Thread Starter
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well maybe ill just do the muffler and cat delete cause if i gut it then im out a cat just in case lol


I just wanna get better mileage and i was told by a buddy with a 6.0 that he ditched cat and muffler and saw 4-6mpg gain

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post #6 of 13 Old 04-10-2012, 09:15 PM
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The cat on my 97' is and has been gutted for a few years now and I haven't had any issues getting it passed.
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post #7 of 13 Old 04-10-2012, 09:33 PM
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They only look to see if the cat is there. So a gutted cat is fine. I'm doin a straight pipe on mine soon and will just clamp a muffler delete in and put on the muffler once a year.

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post #8 of 13 Old 04-11-2012, 02:35 PM Thread Starter
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Quote:
Originally Posted by cweiss87 View Post
They only look to see if the cat is there. So a gutted cat is fine. I'm doin a straight pipe on mine soon and will just clamp a muffler delete in and put on the muffler once a year.

Ya thats what i wanna do.

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post #9 of 13 Old 04-11-2012, 03:36 PM
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Quote:
Originally Posted by HOTWHEELS34 View Post
Yep have to have a cat too. I tried to sneak it by without a cat one time and instant fail. I'm sure it would pass with a gutted cat. I have an EGR delete and it passes.
They pass yours with the egr delete? That is good to know since mine was deleted when I bought it.
Op: what kind of muffler delete do you plan to do? I was just thinkin of puttin in some flex pipe.

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post #10 of 13 Old 04-11-2012, 04:35 PM Thread Starter
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Quote:
Originally Posted by cweiss87 View Post
They pass yours with the egr delete? That is good to know since mine was deleted when I bought it.
Op: what kind of muffler delete do you plan to do? I was just thinkin of puttin in some flex pipe.
Master muffler said they will make me pipe sludged on both sides if i dont tell em what its for lol

just gotta tell em how long and what size

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