Will gutted cat pass emissions?

[TWimmer]

I have an 05' with the cat gutted and a magnaflow muffler I am wondering if I will have any problem with passing emissions? I have to get them this month and I am a little worried about it.

 

[JApol]

Not likely, you might want to go to the dealer and get yourself a new one and check out this link https://www.turbodieselregister.com/forums/showthread.php?t=140350&highlight=cat+test+pipe

 

[JVolpe]

Where are you located? What type of emissions testing??

 

[TWimmer]

I am located in Bountiful, UT. The bad thing is that the testing is done by the County on diesels so I have to go to them and I don't know what will happen if I get caught for gutting the cat.

 

[JVolpe]

Well let us know. When they removed mine I put it in the garage just in case it is needed. Can easily be welded back in. Currently Texas is not doing that type of testing on diesels to my knowledge.

 

[TWimmer]

I still have the body to the cat on the truck. I just took out the insides and had in welded back into place.

 

[Mark Craig]

TWimmer,



I know you have already gutted your cat and I am not beating you up about that, but I do want to warn others about doing it. First the darn thing has a really stupid price if you have to replace it, second the exhaust is bouncing around in that big ole can and although it is better than the cat as far as flow it is still not a very effective way to route exhaust gasses. Get a cat test pipe from someone like MBRP/us, it bolts in place, use band clamps and it's and easy 20 minute remove and replace for when you're not off roading and or racing the truck. That way you still have the cat when you sell and the next owner isn't potentially "stuck" either.



Mark @ DPPI

 

[steved]

Depends on your state idea of "emissions testing"... in PA, as long as it is on there they don't care... I am sorta lucky at the current time... I took mine off and went full 4 inch front to back (yeah, I know... it was already 4inch)... they said the 04s "didn't have a cat"... since mine was a late 04 (600CTD) they didn't even look, but they would on a 05.



In all honesty, I don't really think I saw any improvement in removing it... my only concern was after cruising for say 400 miles on the interstate, it would smoke like the devil if I stomped on it... it no longer does this and I attribute it to the cat "plugging up" with soot during cruising speeds. I know it didn't seem to affect the fuel mileage any.



steved

 

[Todd G]

My '95 had a gutted cat from '97 on and passed every year. Don't worry about it. Tha cat does nothing for particulate emmissions and that's what they test.

 

[Heavyweight]

Twimmer, do not worry,,, you will pass the visual and the inspection... If your truck is in good running order,,, just run her strong before you go into the inspection... and the rest will be history... .

 

[JasonCzerak]

In all honesty, I don't really think I saw any improvement in removing it... my only concern was after cruising for say 400 miles on the interstate, it would smoke like the devil if I stomped on it... it no longer does this and I attribute it to the cat "plugging up" with soot during cruising speeds. I know it didn't seem to affect the fuel mileage any.



steved

Stock electronics, just no cat, I notice a small loss in low end (pre lots of boost) acceleration. Once boost kicked in, it was a bit quicker (to spool as well). Low boost fueling fixes this, and then some.