Exhaust leak at cat - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 06-04-2017, 11:15 AM Thread Starter
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Exhaust leak at cat

I have a mbrp turbo back exhaust and noticed I noticed I have a small leak at the cat and down pipe connection. I used to have to switch between test pipe and cat when I was due for smog and I need to order a new gasket to fix it. But what I was wondering is would this small leak cause loss in performance?
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post #2 of 3 Old 06-04-2017, 11:21 AM
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No, unless a cat is clogged you really aren't going to have issues at all. In emissions states they will throw a hissy fit, but the truck doesn't care. You could rip it out and just weld in a pipe and you would get a slight increase in performance (but again, back to the emissions testing thing...)

Pre-DPF diesels aren't really affected by the cat other than a slight increase in back pressure and a leak in or around it won't cause any issues.

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post #3 of 3 Old 06-04-2017, 11:34 AM Thread Starter
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Originally Posted by CrazyS0b View Post
No, unless a cat is clogged you really aren't going to have issues at all. In emissions states they will throw a hissy fit, but the truck doesn't care. You could rip it out and just weld in a pipe and you would get a slight increase in performance (but again, back to the emissions testing thing...)

Pre-DPF diesels aren't really affected by the cat other than a slight increase in back pressure and a leak in or around it won't cause any issues.
The cat is just for looks anyway there is nothing inside of it. I got sick of switching it back and forth so a pipe and a sledge hammer found its way inside of it. I did notice that the hairdryer noise out the end of the exhaust has been gone for awhile would a leak cause that not to be as prominent?
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