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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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Old 05-16-2019
Frank W. Frank W. is offline
Senior Member
Join Date: Jan 2008
Location: Woodbridge, VA.
Posts: 1,028

Try Auto-Jet: http://www.mandrelbending-tubefabric...lBus/index.php for pipe, fittings, muffler. Excellent site with BlueBird exhaust diagrams.

Also, I recommend this muffler replacement or similar: https://www.xtremediesel.com/magnafl...hoCHB0QAvD_BwE

I may be going against the grain a bit...I think mufflers are a good idea for reasonable sound reduction, especially if the exhaust exits the side/rear of the coach. You may not think your coach is loud...but stand outside and listen to it when running under load, or ride beside it a bit in a car or motorcycle. My suggestion is to mount a non-restrictive straight through muffler.

Our FC has a Magnaflow straight muffler, 4" inlet/outlet, 30" long as I recall...nice sound, throaty, but not obnoxious. The removal of the OEM muffler also resulted in a felt performance increase...the OEM was pretty restrictive and filled with soot.

Mr. Finn's comments & photo: https://www.wanderlodgeownersgroup.c...6&postcount=28 (repeat of Chris's link).
Frank W.
Woodbridge, VA.

Coach photos & comments: http://www.wanderlodgeownersgroup.co...php?albumid=79

Last edited by Frank W.; 05-16-2019 at 08:30 AM. Reason: found John's comments...RIP sir.
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Old 05-16-2019
flyingjunebugs flyingjunebugs is offline
Senior Member
Join Date: Jan 2011
Location: Anchorage
Posts: 265
Default Try a Donaldson 51 muffler.

Hi, I really like my Donaldson 51 Diesel muffler, quiet and low resistance to flow.
No droning sound at any time.
On Semi trucks, considered to be the premium to which others are compared.
Just do not install a “gas” muffler!
Bruce Junes
Anchorage, Alaska
1987 35 FCSB “SOLD”
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