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[GMCnet] choice of muffler [message #321004]

Mon, 24 July 2017 17:47

Ek_Lektro

Messages: 167
Registered: March 2011

Karma: 2

Senior Member

Greetings! Turns out that the double mufflers on my ’78 Eleganza need to be replaced and i’m wondering what brands/models people are happy with.
I have the Spintech (single muffler) on my ’76 Birchhaven, and its pretty loud and throaty,
and i’m sure that has a lot to do with it being a 455.
My Eleganza ( w/403 ) has always been pretty quiet and would like to keep it that way :)
I’m currently down in Tijuana again, and AutoZone and Napa here don’t have any of the models (part numbers) that i see on the Interchange… Flowmaster or Walker,... nothing. The installer here is offering a “Flowmaster quality” (generic) single muffler for $150. But i think that’s pretty close (or more than) what i’d probably pay for actual Flowmaster back in CA(?) ...so might not get it fixed this trip. But figured i should start looking into the parts, and the main question: If its indeed best to convert over to a single muffler…. or stay dual.
Thanks for any info and opinions, cheers!
Greg / Los Angeles
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Re: [GMCnet] choice of muffler [message #321005 is a reply to message #321004]

Mon, 24 July 2017 18:08

Larry

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

Karma: 10

Senior Member

I had that Spintech on my coach...very loud. Here is what I did. 70 series Flowmaster and Vibrant 1142 3" Ultra Quiet Resonator.

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

JWID

Larry

78 Royale w/500 Caddy
Menomonie, WI.

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Re: [GMCnet] choice of muffler [message #321011 is a reply to message #321004]

Mon, 24 July 2017 19:31

lqqkatjon

Messages: 2324
Registered: October 2010
Location: St. Cloud, MN

Karma: 5

Senior Member

Replaced my 2 oem mufflers with these:

https://m.summitracing.com/parts/WLK-18425

Maybe part# will cross

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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Re: [GMCnet] choice of muffler [message #321092 is a reply to message #321004]

Tue, 25 July 2017 17:23

Scott Nutter

Messages: 782
Registered: January 2015
Location: Houston/San Diego

Karma: 4

Senior Member

Greg,
Get out of TJ and go to Oceanside.
Jim at Warners Mufflers is the one to go with. He owns the place and does all the work on the classics.

He has done all the mufflers on my 8 classics, including my old Palm Beach 455.
Last time i checked flowmaster has 3 different volume mufflers.
But I highly recommend his shop.

Warner mufflers. Off Douglass. Off the 76. Oceanside, Ca

Scott Nutter 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI Houston, Texas

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Re: [GMCnet] choice of muffler [message #321104 is a reply to message #321004]

Tue, 25 July 2017 19:42

Ek_Lektro

Messages: 167
Registered: March 2011

Karma: 2

Senior Member

Keeping the conversation going…

> and the main question: If its indeed best to convert over to a single muffler?. or stay dual?

I think a single muffler might have opportunity for a bit better ground clearance, but other than that?

> Replaced my 2 oem mufflers with these:
> https://m.summitracing.com/parts/WLK-18425

that looks like the easiest option Jon, thanks…
Although i do have to measure my current inlet and outlet size to be sure…

> Here is what I did. 70 series Flowmaster and Vibrant 1142 3" Ultra Quiet Resonator.
> http://www.gmcmhphotos.com/photos/g3604-rear-mounted-flowmaster.html

thanks Larry, i’m gonna look closer at that when i get back to a laptop (pics too small on iPhone :)

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