New high-flow cats. Do I need new muffler also?

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Old 06-22-2009 | 02:59 PM
mg175150's Avatar
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New high-flow cats. Do I need new muffler also?

Hello

I have decided that I probably have plugged cats and am thus going to replace them with 2 magnaflow high-flow cats. I have a 1999 F-150 5.4 V8 4x4 with about 186k. One recommendation was part#94106 for a quieter sound. Can somebody verify if this is indeed the right part # for a quieter sound, or if not recommend another? Also, since I am replacing both cats does it automatically make sense to replace the muffler while I am at it? Can somebody recommend a muffler if this is indeed the case? I am trying to keep the noise level as close to stock (quieter) as possible.

Thanks for the help.
 
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Old 06-22-2009 | 09:48 PM
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From: nc
the muffler doesnt need replacing long as its not rusted out. im pretty sure the 94106 cats are the louder ones. Darrenws6 can tell you for sure.
 
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Old 06-22-2009 | 09:54 PM
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94106 cats are NOT at all quiet, they are near cat-less sounding. Any hi-flow cat will be substantially louder than OEM.
 
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Old 06-22-2009 | 10:02 PM
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there ya go
 
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Old 06-23-2009 | 09:08 AM
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Thanks for the replies. Do I have any "quiet" cat options besides OEM? I would hate to spend that kind of money on OEM cats.

Thanks.
 
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Old 06-23-2009 | 12:20 PM
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Go with 4 replacement Magnaflow cats and it shouldn't be too bad. I would say two but the other two would keep the volume down a tiny bit more. Call Magnaflow direct and ask what would be the best choice for you.
 



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