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Old 07-04-2013, 11:00 AM   #1
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Which muffler to buy for my Argosy

In the interests of keeping the piece and not trying to make to much noise in the neighborhood as I get ready to start the 454 for my Argosy for the first time I think it might not be a bad idea to have a muffler installed

I'm planning on a single muffler system for the 454 since there isn't a whole lot of open space under the little 20' motorhome.

So...any suggestions on what muffler to buy?

Brad
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Old 07-04-2013, 11:43 AM   #2
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There's nothing like the sound of an open header 454!
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Old 07-04-2013, 11:45 AM   #3
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Old 07-04-2013, 11:54 AM   #4
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We put a pair of free flowing school bus type mufflers under a friend's Argosy motorhome. Less backpressure han most stock mufflers, compact, and not loud. We got them from Napa, I think they were made by Walker.
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Old 07-04-2013, 12:05 PM   #5
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Because we keep our vehicles for a long, long time, I have always bought Midas mufflers. They're made well, and Midas has been in business for over 50 years. Plus, they don't give you a hassle when the mufflers need replacement. Just keep the purchase receipt in a safe place, if you plan to keep your vehicle long enough to replace the mufflers, again.

The 454 exhaust sounds powerful regardless of which muffler you put on it; so standard Midas mufflers sound throaty, but refined.

HAL, our old Chevy, crew-cab pickup, had a 454 v8 with tuned exhaust headers; so the exhaust was a little louder than normal to begin with. However, the stock Midas mufflers provided an impressive powerful sound that was quiet in the neighborhood and moderately loud when accelerating briskly, with no annoying drone while cruising on the highway.

Midas mufflers may cost a little more initially, but we always got that money back when we replaced them years later.
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Old 07-04-2013, 01:14 PM   #6
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Quote:
Originally Posted by dadstoy View Post
There's nothing like the sound of an open header 454!
And therein lies the problem...
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Old 07-04-2013, 04:39 PM   #7
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I say the loudest meanest throatiest muffler you can find!
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Old 07-04-2013, 05:21 PM   #8
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2nd the Flowmaster mufflers. They offer significant air flow over most but still provide a reasonable amount of sound reduction. They are a bit louder then stock not obnoxious if the rest of the exhaust system is designed well. I'd go with at least a 3" pipe design. As a second choice you could look into the Dynaflow mufflers as well.
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Old 07-04-2013, 06:16 PM   #9
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Quote:
Originally Posted by overlander63 View Post
We put a pair of free flowing school bus type mufflers under a friend's Argosy motorhome. Less backpressure han most stock mufflers, compact, and not loud. We got them from Napa, I think they were made by Walker.
Terry,

Unfortunately there isn't room for two mufflers under the Argosy. It's packed tighter than a sardine can under there!

Brad
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Old 07-04-2013, 06:19 PM   #10
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I say the loudest meanest throatiest muffler you can find!
Should I hop up the rear end as well...
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Old 07-04-2013, 06:28 PM   #11
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Phoenix, there aren't any Midas outlets anywhere near me. Matter of fact I don't know when the last time I saw one of their stores. I'll have to see if they sell online.

Thinking about it more, I'm going to need the entire exhaust system eventually so I probably should put a little more thought into what I need to buy so I only buy once

It's definitely going to be a single muffler so that's a starting point. The header collectors are 3" so I'm assuming I need to buy a 2 into 1 Y pipe with 3" input pipes and a 3" outlet pipe.

For the time being I think I need to buy the 2 into 1 Y pipe. I'm also going to need at least one 90 section and some flanges to tie into the header collectors. The closest we have to a Midas around here would be Meineke. They've done exhaust work for me before so I guess it makes sense to stop in tomorrow and see if I can get some of the pieces from them.

Oh yeah, I really would prefer a quiet exhaust system

Stay tuned...
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Old 07-04-2013, 06:48 PM   #12
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Flowmaster builds mufflers in three volume levels:
  1. Aggressive
  2. Moderate
  3. Mild-Stock
The stainless ones also have a lifetime guarantee. I've seen RV applications listed before, too.

It's what I'd use in your place. (I agree about the quiet system)

On edit, those volume level descriptions are from their website.
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Old 07-04-2013, 07:03 PM   #13
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I have seen dual exhaust run one high, the other low. Slight stagger in muffler changes harmonics too.

If you stick with 2-1 y-pipe, I would run at least 3.5" pipe. You can add flanges so pipe section can be removed to service specific areas. That will ease space concerns a bit.

If you drop the exhaust a bit further you can gain added space. How much ground clearance do you have now? The distance can improve sound absorption.

Might look into having headers ceramic coated too. That will extend life with better heat retention inside pipe. Just some ideas...
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Old 07-13-2013, 01:46 PM   #14
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