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Old 12-31-2013, 11:58 AM
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03 Limited High Output replacement muffler

Hey all, been a while since i posted. My family also has a WJ with a HO engine in it. She unfortunately is always outside and i think all these years of hot and cold weather is starting to take its toll on hoses and other various items. I suppose its bound to happen.

Most importantly, the muffler on the 03 is starting to rust through and split at the seams. Its gotta go and I would like to do this soon. I want to get a Walker QuietFlow SS as a good (quiet) replacement but my concern is their site saying that it excludes HO vehicles. The walker 21640 is the latest replacement. I included a link to walkers fitment guide.

Walker Exhaust Master Catalog

What I would like to know from the experts is can i easily get a 21640 and have a shop weld it on? Will it fit? If this is a problem does anyone have any recommendations as to an alternate like-OEM replacement?

Have a great new year. Thanks Much! Mike
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Mike, 26, have a 2006 Dark Khaki WK Limited 4.7L; SICK stock 17" 5 Spoke Ronins :/ , Walker QuietFlow muffler, 7500K headlamp and fog Halogens, LED license plate lighting, Interior LED lighting, Champion Platinum Power spark plugs.

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Old 01-01-2014, 12:56 PM
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Re: 03 Limited High Output replacement muffler

Hey Mike! I would say that the only reason that chart excludes the HO is because the HO doesn't use the 3rd cat on the midpipe. It only has the two built into the the y pipe which also may be different between the HO and regular 4.7. The muffler itself should be fine. I've used a lot of walker products over the years and they make some pretty good stuff.
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OK, fine...I'll admit...some amber lamps are good, and necessary.
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Old 01-01-2014, 01:02 PM
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Re: 03 Limited High Output replacement muffler

Dad installs a ton of Walker stuff at his shop and it has a good consistent quality. I personally would swap out the stock muffler for a large body stainless Magnaflow #12586.

Amazon.com: Magnaflow 12586 Stainless Steel 2.5" Oval Muffler: Automotive
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Old 01-01-2014, 01:54 PM
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Re: 03 Limited High Output replacement muffler

That is what i was hoping to hear. Knowing i can either put on the Walker quietflow or the magnaflow as a option is good. I will probably order one of these soon. Thanks again everyone!
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Mike, 26, have a 2006 Dark Khaki WK Limited 4.7L; SICK stock 17" 5 Spoke Ronins :/ , Walker QuietFlow muffler, 7500K headlamp and fog Halogens, LED license plate lighting, Interior LED lighting, Champion Platinum Power spark plugs.

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Old 01-01-2014, 08:51 PM
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its a resonator not cat. and even if it was shouldn't it have a o2 after it?

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Old 01-01-2014, 10:37 PM
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Re: 03 Limited High Output replacement muffler

No it's a cat. Check out no.5 from the parts book.

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Old 01-06-2014, 08:54 PM
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interesting, I don't have that, something that's resembles that I do have but its round In shape and been told its a resonator. only cats are on my Y pipe last o2 sensor is right before this round spud

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Old 01-06-2014, 09:15 PM
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Re: 03 Limited High Output replacement muffler

It's kinda funny in '03 and '04 some have em,some don't. Maybe somebody did ad a resonator to yours. How's it sound? I've been thinking about adding a resonator tip.
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Old 01-30-2014, 04:19 PM
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Re: 03 Limited High Output replacement muffler

I'm replacing from the CAT BACK on my 03 Limited this Monday with a stainless steal version and one large muffler but not the original one. custom made all in around 300. The CAT in the middle has the O2 sensor after it and there's also a sensor before it on the downpipe.
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Old 03-10-2014, 12:15 PM
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Re: 03 Limited High Output replacement muffler

FWIW... I removed the 3rd cat and installed an Incynerator (SP) cheapie muffler to the factory tailpipe- sounds AWESOME.
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