Hey Silvercrew...
 

Does NC consider a turbo a muffler? Last year I had my powerstroke straight-piped and they failed it for no muffler, bought a 4" glasspack (8" long lol) and it passed.

Just curious because I know some states count a turbo as a muffler.

For what it's worth, I've been running without mufflers and stacked for 8 years with no trouble getting inspected. About the legality of it, I don't know. maybe someone will be able to tell you for sure.

As I've learned over the years...if it came from the factory with mufflers, then it's supposed to still have mufflers...now what you installed to pass inspection would pass as a muffler. But, if ya know the right folks to carry it to and it doesn't have to be hooked to a computer...then ya can get by with almost anything...learned that too.

The problem was I had dual 3" exhaust exiting both sides behind the cab. It failed inspection because it didn't have mufflers, but they didn't care that I dont' have a cat anymore.
I put on a straight piece of 4" pipe with the 4" glasspack on it just dumping out under the bed. They failed it again because they said it needs to exit outside the edge of the vehicle behind the cab.

Now I have the same 4" pipe and glasspack with a 90* turnout exiting behind the cab.

Yes technically you have to have a conventional muffler. If its a diesel Ill pass it without one. But as far as catalytic convertors/Diesel ox catalysts go, I cant believe you got someone to pass it without one.

Yes the exhaust must be past the back of the cab and exit at the rear of the truck or at the bedside.

The cat was removed by previous owner.

Ford dealer passed it with stock exhaust minus cat, and another shop passed it with my current exhaust setup.

Dam you got lucky. They must have not looked at it very close Im sure.

Are you sure that it had a cat, not all of these trucks did . my 2000 truck never had a cat but the 07 did. in 2000 only the Cali models had exhaust catalyst but I'm not sure about the OBS trucks. IMHO emissions components on diesel vehicles are completely ignorant. are they needed? yes but the crap that works on a cleaner burning gasser will not work on a good oh sooty diesel IE the EGR valve on the 6.0.

As far as I know all of the OBS powerstrokes came with a cat.

I know mine had one because the P.O. welded in a cat delete pipe.

Oh I didnt know we were talking diesels.. Im not familiar wit the OBS trucks to say if it had one or not. I know some of the 99+ 7.3 trucks had them and some didnt, think one thing it had to do with was if it was a straight drive or auto.