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[GMCnet] Muffles [message #318119]

Mon, 29 May 2017 00:50

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

Has anyone installed a series 40 Flow master Muffler? Putting two on so we can make our next trip Wed. Think I need to call Jim K at Applied when we get back. Bob Dunahugh 78 Royale Member GMCMI
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Re: [GMCnet] Muffles [message #318120 is a reply to message #318119]

Mon, 29 May 2017 01:46

Richard Denney

Messages: 920
Registered: April 2010

Karma: 9

Senior Member

The Series 40 is the standard Flowmaster hot-rod muffler, a bit shorter
than the Series 70 we usually use, as I recall, and louder. I have a pair
of an "alternative brand" version of the Series 40 (Dynomax), and they have
worked fine. Only ones I could get to fit in front of the existing Y-pipe,
which I have still never needed to change.

Rick "who'd use 'em if that's what's available" Denney
On Mon, May 29, 2017 at 1:50 AM Bob Dunahugh wrote:

> Has anyone installed a series 40 Flow master Muffler? Putting two on so
> we can make our next trip Wed. Think I need to call Jim K at Applied when
> we get back. Bob Dunahugh 78 Royale Member GMCMI
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
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Re: [GMCnet] Muffles [message #318123 is a reply to message #318119]

Mon, 29 May 2017 07:58

Larry

Messages: 2875
Registered: January 2004
Location: Menomonie, WI

Karma: 10

Senior Member

Don't put the 40's on until you hear feedback from several that have them. The few that I have talked to found them to be to loud for their liking. I have the single 70 series Flowmaster in the rear and found that I had to add a resonator to cut the "rap" when I had my foot in it. JWID

http://www.gmcmhphotos.com/photos/g3604-rear-mounted-flowmaster.html

Larry

78 Royale w/500 Caddy
Menomonie, WI.

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Re: [GMCnet] Muffles [message #318158 is a reply to message #318119]

Mon, 29 May 2017 16:19

captjack

Messages: 271
Registered: February 2010
Location: Sebastopol, California

Karma: 1

Senior Member

I've got 40's on my coach. I think they're too noisy and even more importantly my wife doesn't like them. I've been thinking about changing them out. I was under my coach and found that the aluminum body panel above them was cooked and distorted. Flowmaster makes heat shields and after sucuring the aluminum panel back up, I'm to install the shields. I've read that they reduce the noise. I'm hoping they do, but probably not that much. I was thinking of putting a piece of lead sheet between the shield and the muffler for further sound reduction, but looking at exhaust temps and the melting point of lead, thought better of it.

Jack Christensen - K6ROW, '76 Glenbrook/Clasco - "The Silver Bullet", Sebastopol, CA

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Re: [GMCnet] Muffles [message #318169 is a reply to message #318119]

Mon, 29 May 2017 19:22

JohnL455

Messages: 4447
Registered: October 2006
Location: Woodstock, IL

Karma: 12

Senior Member

40s can hardly be called a "muffler". I put a 2.5/2.5" series 50 on my Jeep as it was all I could find in the config I needed and it's throaty but tollerable with no brash RPM range. Some cheap mufflers are like megaphones at certain pulse rates.

John Lebetski
Woodstock, IL
77 Eleganza II

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