Keep the Cat? - Ford Powerstroke Diesel Forum
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Old 05-28-2011, 08:50 AM
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Exclamation Keep the Catalytic converter?

Hello. I'm looking at a diamond eyes turbo back system for my 6.0L and wondering if I should keep the cat or not. Will keeping the cat negate the advantages of the 4" system? I don't live in emissions testing area. I'm not a tree hugger, but I am concerned about the environment...

Last edited by Jasun26; 05-28-2011 at 09:23 AM. Reason: update title
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Old 05-28-2011, 10:48 AM
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get rid of the cat. I fail to see the point in a 4" exhaust if it necks down to 3" in one area.
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Old 05-28-2011, 10:57 AM
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Will removing the cats help to get better mpg? Im thinking it should.

Last edited by SharkDiver; 05-28-2011 at 12:19 PM.
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Old 05-28-2011, 11:47 AM
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I was on the fence deleting my cat, most people have reported no difference in MPG with a Cat delete, so my feeling is why bother.

John
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Old 05-28-2011, 12:11 PM
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I just took my cat off last night and was suprised to see how restrictive it was. I was preping for my new exhaust and after looking, I think that I will be leaving it out. Found out that diesel trucks are not emission tested in my area! ROCK.
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Old 05-28-2011, 12:12 PM
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If you EVER intend to sell your truck and you have deleted your catalytic converter from the truck's exhaust you will be committing a federal-level fraud in passing the truck off as street legal.

At the very least be forewarned of the potential consequence of this off-road emissions modification and keep the catalytic converter capable of being reinstalled with a delete pipe.

You will pollute more with the deletion of catalytic converter and you will relieve a bit of back pressure - both are true statements. There is no reason for the presence or lack of presence of the catalytic converter to affect fuel economy unless you have a "poisoned" catalytic converter - which would require replacement to provide the reduction of oxides of nitrogen and other pollutants...if it were obstructing exhaust flow then there is likely something wrong earlier in the combustion process like excess fuelling or incomplete combustion (perhaps an indicator of piston ring wear...lack of compression anyway).

Jonathan

P.S. I have a 4" turbo back stainless exhaust with an aftermarket - smaller than stock - catalytic converter from Magnaflow...probably not definitively street legal but I can put a stock catalytic converter back on the truck - I'm never selling my truck anyway. The original owner hollowed out the stock catalytic converter but as it has a 3" restriction I did opt for a full 4" passage...my wife is very sensitive to the exhaust so a catalytic converter of some sort is definitely a must. Just providing full disclosure with my earlier observation.

Last edited by howell_jd; 05-28-2011 at 12:17 PM. Reason: Full disclosure
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Old 05-28-2011, 04:04 PM
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Thanks everyone for your response. I have decided to stay with my cat in my exhaust system. I don't think it will hurt MPG enough to justify added pollution.

BTY Thank you for your service MAJ Howell...
13year ex Army here.
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Old 05-28-2011, 04:23 PM
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It is really easy to make it so the cat can be bolted in and out as needed. It is very restrictive and while you might not see a big change in fuel mileage you will see a drop in egt's with it gone.
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Old 05-28-2011, 04:40 PM
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If you really don't want the cat, I would love to have one. I live in the emission Nazi state...CA. We might be able to work something out as far as payment and shipping if you decide to
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