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Old 07-13-2011, 10:59 PM
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4.7L Catalytic Converter replaced

I just wanted to post what catalytic converter has worked on my 06 4.7L wk.
I first tried to replace my cat with a magnaflow 49956 however, it resulted in a P0430 code within a month of driving.
I now have a magnaflow 99106HM installed and it seems to work fine. I installed it about 3-4 months ago and no codes. I paid $70 for it online. Hope this helps anyone who has to change theirs and doesnt want to pay for $1000+ for an oem replacement.
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Old 07-16-2011, 07:06 PM
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Re: 4.7L Catalytic Converter replaced

did you notice any change in your gas mileage and throttle response after you replaced them?
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Old 07-16-2011, 07:36 PM
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Re: 4.7L Catalytic Converter replaced

thanks OP. this is good to know/

I used a magnaflow direct replacement on my XJ and I flew thru the SMOG test and no codes.
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Old 07-18-2011, 04:48 PM
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Re: 4.7L Catalytic Converter replaced

no difference as far as i could tell
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Old 07-21-2011, 11:35 PM
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Re: 4.7L Catalytic Converter replaced

its time to replace mine, just took it to the dealer today to have the pcm re-flashed for a tsb on the P0430 and P0420 codes and sure enough they came back. Did you have them welded on and how much did you pay? I just want to get a price to make sure im not paying to much to have mine installed when I get them. Thanks for your help.
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Old 07-22-2011, 06:25 AM
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Re: 4.7L Catalytic Converter replaced

I was wondering if the same converter would work for my 2005 3,7L Laredo.
Any idea?
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Old 07-22-2011, 07:41 PM
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Re: 4.7L Catalytic Converter replaced

Quote:
Originally Posted by 2005 WK View Post
its time to replace mine, just took it to the dealer today to have the pcm re-flashed for a tsb on the P0430 and P0420 codes and sure enough they came back. Did you have them welded on and how much did you pay? I just want to get a price to make sure im not paying to much to have mine installed when I get them. Thanks for your help.
$0...I welded it on myself. I would look for someone to do it for $40-$50. That is just a rough guess though
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Old 07-22-2011, 07:50 PM
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Re: 4.7L Catalytic Converter replaced

Quote:
Originally Posted by Ylfig View Post
I was wondering if the same converter would work for my 2005 3,7L Laredo.
Any idea?
Hmm... My opinion would be to use a cat with the same dimensions as the one i used but not heavy loaded. I would think that Magnaflows 91006 would work. I think if you used the heavy loaded cat it may result in restricting your exhaust flow a little to much. Again this is just a guess maybe someone on here can better inform you.
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Old 08-31-2011, 11:25 PM
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Re: 4.7L Catalytic Converter replaced

I know this is a older post but i just wanna know how those cats are holding up for you? Have you gotten any codes or are they still holding up?
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Old 09-07-2011, 12:15 AM
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Re: 4.7L Catalytic Converter replaced

no codes and they are still holding up great
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Old 09-07-2011, 01:17 AM
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Re: 4.7L Catalytic Converter replaced

thanks man, i got mine sitting in my garage, installing them this weekend.
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Old 09-08-2011, 09:30 AM
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Re: 4.7L Catalytic Converter replaced

at how many miles should I replace the cat?
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