| Stock replacement mufflers [message #309556] |
Fri, 28 October 2016 12:15  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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My PO put on some shorter body 2.25 offset/offset mufflers. This required an extension inlet pipe on each side. I'm fighting an exhaust leak at the left donut as the pipe is sitting a bit funky. Someone posted about flowmaster 50s but I think they would be too loud on long trips and expensive. Does anyone have road miles on the Cinnabar mufflers to share? Fit and sound and power comments? My manifolds are good, my exhaust pipes and Y are good, long pipes and tailpipe are NOS GM so not interested in headers or rear muffler discussion at this time.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Stock replacement mufflers [message #309558 is a reply to message #309556] |
Fri, 28 October 2016 13:50  |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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somewhere I a post walker OEM size replacement 18425 bought from summit for like $35 a muffler. I bought in may of 2014. So, probably 5000 miles with no complaints.
if you are fighting that leak, I would think if you replace that extension inlet with a woven flex pipe, that would put less stress on the exhaust doughnuts??
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
[Updated on: Fri, 28 October 2016 13:52] Report message to a moderator |
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| Re: [GMCnet] Stock replacement mufflers [message #309560 is a reply to message #309558] |
Fri, 28 October 2016 14:17 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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If you're looking for a 2.5” in and out the All Stainless muffler part number Magnaflow 12557 is available and Jim K probably has the best price on this muffler.
For a direct replacement the NAPA # SMU18425 is the same as a Walker muffler 18425, both lower priced.
https://www.napaonline.com/napa/en/p/SMU18425/SMU18425
https://www.summitracing.com/parts/wlk-18425
I use the Magnaflow mufflers and all stainless piping except for the 3” run the back, I also have #’ SS tail pipe on the end.
JR Wright
Michigan
> On Oct 28, 2016, at 2:50 PM, Jon Roche wrote:
>
> somewhere I a post of part number for a walker OEM replacement bought from summit for like $35 a muffler. have I think 2 summers on them, maybe 5000
> miles with no complaints.
>
>
> if you are fighting that leak, I would think if you replace that extension inlet with a woven flex pipe, that would put less stress on the exhaust
> doughnuts??
>
>
> --
> Jon Roche
> 75 palm beach
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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