Just bought a used 06 Cummins with 23,000 miles on it. Got it home, crawled underneath and noticed there is a muffler and what appears to be a resonator (short, round canister about twice as big as the exhaust with tapered ends) but NO Cat. There is an extra joint in the pipe between the turbo and the resonator----I assume that's where the Cat used to be. Now, the great part is I live in the only county in Idaho that requires emissions testing. Should the dealer be responsible for selling me a vehicle that had the Cat illegally removed? When I have the emissions test performed, I assume they will look for the Cat with their mirror, but how do they know if it should have one? After all, early 04's did NOT have a Cat and late 04's DID have a Cat. What am I up against here?

 

got pics of that forward "resonator" sounds like the cat itself.......... post it up and we should be able to help you.

 

That resonator is most likely your cat, but its possible its been switched out to a normal resonator. I believe the cats look like them. That resonator ( if that's what it is) should fool most inspectors.

 

Sounds to me that you are looking at the cat. If it's before the muffler, it's probably it. The so called resonator is located by the rear axle. The cat looks like a spun metal piece. The resonator looks like a smaller muffler.

 

I'll take another look and make sure there's nothing else near the rear axle. I thought the order was turbo-cat-resonator-muffler. Are you saying the resonator is last? Thanks

 

Sounds like a cat to me. This is the CAT on a 04.5.

 

That's it.......thanks I was looking for pictures on the forums but couldn't find any.

 

Well, if the pic is what you have, that's the cat, then the previous owner removed the muffler. ME's (muffler elimination) are very popular on our trucks. I removed mine and installed the ME pipe.

CD

 

I always wondered what that thing was... didn't know mine had one.

 

I don't think mine was sold with one either , problably a Monday built truck and they forgot it

 

I wonder if it only came on trucks destined for pollution-phobic states?

 

No they all had them 04.5 and up, some just went MIA after that.

 

Seeing that makes me want to get my drill bit out.

 

those things seem to fall of pretty regularly

 

Or get a pipe shooved through them, looks like a cat, must be a cat <---Inspector