Exhaust Questions
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
Here is what the cat looks like inside, cut in half, lots of fine mesh wires to catch small diesel particle, I guess ...
Here is what a clogged cat looks like. I was holding one end up to the sun light and the small bright spot is about 1/8 inch in size ...
Here is what a clogged cat looks like. I was holding one end up to the sun light and the small bright spot is about 1/8 inch in size ...
Elder User
Joined: Jan 2012
Posts: 584
Likes: 0
From: Southern West Virginia
WOW! That's pretty dang restrictive. I'd never seen one inside before (except an empty one).
Cargo Master
Joined: Nov 2010
Posts: 2,797
Likes: 10
Gut any cat or find a place that will test you without one. Putting a cat on a diesel is strictly for emission compliance and they are absolute a waste of money and time. Luckly we have a place that will test you and they do not care what you have under there as long as you pass opacity. If you want to do it right go get som POS cat from somebody, weld flanges on either end and same as the pipe. Bolt it into place for the test, then remove it and bolt in a piece of straight pipe afterwards. This is what I did just in case. Or gut a stock one.
A cat on a diesel is absolutely absourd....
A cat on a diesel is absolutely absourd....
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Elder User
Joined: May 2010
Posts: 970
Likes: 0
From: Northeast Ohio
Yea that's what i thought too i read something about the valve cover will say if you need one? is it possible to just which out the valve cover and say it never came with one?
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Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
Does your county do a visual inspection or just the sniffer test? Many guys are getting through the sniffer test without the cat in place. If they don't do a visual, I think you would probably be okay running cat-less. If not, and they do a visual, then I guess you're back to having to figure out how to get a cat on there.
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Elder User
Joined: May 2010
Posts: 970
Likes: 0
From: Northeast Ohio
Ok ive done alot of searching and ive found that most places don't check for a cat they usually just do a sniffer test. but does anyone have any info about that valve cover swap? id like to maybe try that if its possible to find one it would be cheaper then a cat that's for sure.
Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
I have never heard of that before. As far as I know all the 7.3's had a cat unless they were installed in a medium duty truck. The only other way I know around the echeck would be to license your truck as a commercial vehicle.
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Elder User
Joined: May 2010
Posts: 970
Likes: 0
From: Northeast Ohio
So maybe check around at bone yards for a 7.3 in a bigger truck like maybe a superduty? or something of equivalent size and it shouldn't have the cat label on it? but if i'm going to go this far is it against any laws to remove the sticker completely and say paint the valve covers? then echeck has no way to tell is if was or wasn't equipped with a cat right? because the engine is not original to the truck. then i could just put them on a piece of paper and save them for build specs and engine number and stuff like that.
Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
I am not sure whether they look at the sticker on the valve cover or just go by the VIN of the vehicle. You're on your own there. I really don't have any experience with that kind of thing.