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Old 09-23-2008, 09:15   #1 (permalink)
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Catalytic Converters

I have a 2003 F-150 4x4 King Ranch and i was wondering since my truck has 3 converters if i take them off and put only 2 new magnaflow converters in there will i be able to pass my emm. test and will it sound louder or deeper or let it breath better since i have true dual exhaust with 2 flowmaster mufflers and headers and an cold air intake?

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Old 04-17-2009, 19:06   #2 (permalink)
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Re: Catalytic Converters

3 converters? I'd just replace the two larger ones in question with the Magnaflow units. They will allow more airflow. I have heard different stories from several users in other forums that they can fail after 1-2 years of use; as they are afterall, a high performance item. Just my $0.02
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Old 04-23-2009, 21:56   #3 (permalink)
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Re: Catalytic Converters

i dont think you will have any problem running them and passing inspection.if you do you can buy o2 sensor bypasses. my bro has them for his truck and doesnt even run a cat. it threw the check engine code before he bought the bypass and now since he plugged them in hes fine gets it inspected every year, his is a little older tho a 2001
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Old 01-12-2011, 14:15   #4 (permalink)
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Re: Catalytic Converters

the cat closest to the exhaust manifold is the cold start emissions cat. you can take that out completely and still pass emissions. you probably need an 02 sensor bypass, but you can use the Spark Plug Adapter trick if needed.
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Old 02-25-2011, 12:09   #5 (permalink)
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Re: Catalytic Converters

Some states also visually check for removed or altered emissions equipment along with the actual testing, I know NC does and if they find a part that has been removed or altered they fail emissions testing. NC checks everything right down to the restrictor for unleaded fuel nozzles in the filler neck of the gas tank. I would suggest checking with an inspection station before removing/replacing anything.
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