How to fool inspectors

Baker

Baker

Well-Known Member
Joined
Mar 25, 2010
Location
Suffolk, VA
Ok so I have a '06 f350 with a 4" turbo back mbrp exaust. Took it to get inspected the other day and it got rejected bc it doesn't have a cat converter. Va doesn't have emissions on diesels but bc the truck came from ford with a cat it has to have one. How can I make it look like it has a cat without actually installing it so it will pass inspection? Would it take away from my flow if I was to put a straight pipe through the cat and weld it into my exhaust ? Meaning go from 4" reduced to stock cat diameter and then back to 4" after cat? Would that be enough to pass? Thanks for help
 
yeah that is rough!! if you gut the stock cat and cut both ends off of it where it will slide onto mbrp pipe and then weld it on both ends where it looks like it is part of the system it will pass visual inspection
 
Set up your exhaust with a cut out section. Flange a old cat with a 3 or 4 bolt flange on both ends. Bolt it in for inspection. Remove and replace with a pipe flanged the same way for daily use. Did this on Dad's old hunting truck for years. Takes a few minutes to swap out, but it only happens once a year.
 
I took it to a real small shop but the guy was kind of a dick can't really blame him though he was just doing his job. Thanks for the input I might try the cut in half and re weld over my mbrp sounds alot better than having to take the cat on and off every year
 
So your MBRP exhaust is welded together????

Either way, I would cut out (or remove if bolted on) a section to install your cat. Use 4" band clamps and bolt it in rather than welding it. Take it and have it inspected then come home and remove the cat and put your old straight pipe back in using band clamps as well.
 
My mbrp is clamped. As for another shop the guy peeled my sticker off and replaced it with a rejection sticker so if I take it somewhere else they are going to know what's up.
 
I'm stuck in this same situation since in MN we don't have any inspections. I was just going to go from shop to shop to have it inspected until one of them passed me without a cat. However I was told by an inspector that once you fail, you need to go back to the same shop until it passes. I just bought stickers back in MN again to get me by another year before I have to deal with the state of NC. I cant see spending big $ on a cat that I don't want or need just so an inspector can look at it and click the mouse.
 
Are all diesels required to have a cat or is it because of it being 06 that causes it to be a requirement. I don't have a cat or muffler and pass no problem, but mine is a 97. I would like to get a 4" mbrp one day and this would be a concern.
 
I don't know about north Carolina but in Virginia it wouldnt be an issue for mine except that my truck came from the factory with a cat. I didn't realize this until after I did my exhaust. I'm military and my home state is Vt. So when my reg runs out in va I'm gonna reg in vt and not worry about it
 
Big tip for whoever inspects it i tip my guy 30 in va to do mine and still catch hell over it when pulled over!
 
I ended up just cutting both ends of cat, punched it out and burned it back into its original spit in the exhaust I didn't really want to do that but I'll find out today if it passes lol
 
How much flow do you really gain by not having a Cat?

Last exhaust shop I went to said that Cats have become high flow compared to days of old.

Is it really worth the hassle?
 
mbalbritton said:
How much flow do you really gain by not having a Cat?

Last exhaust shop I went to said that Cats have become high flow compared to days of old.

Is it really worth the hassle?
Click to expand...

No. I've got the last CTD made without a cat. The new trucks have cats and still make a shitload more power than mine.
 
I noticed a pretty good gain when I took mine off my 6.0
 
Are your running the strip to shave .01 second off or pulling a sled for competition?

Theres plenty of ways to legally gain power is all I'm saying. Now you're in a pickle.

Put the cat back on, drop some propane in the system and keep haulin ass.
 
^cat converters on diesel performance applications are not as comparable to gas engines, especially when they can become fouled with soot VERY quickly. I would say comparing stock trucks with or without the converter, there is a minimal difference.


Propane isn't really today's 'performance' additive either.
 
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