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12-26-2019, 07:36 PM
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#1 |
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Registered User
Join Date: Oct 2019
Location: Monaca, PA Western PA
Posts: 93
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Muffler suggestions
My 71 C20 is way to loud. It has a Blueprint 355 with headers dumping into 3 inch pipes, that turn out before the rear tires. It has generic straight cherry bombs about 18 inchs from each header.
I like the deep rumble, but its way too loud. What do you all suggest? |
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12-26-2019, 07:48 PM
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#2 |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,628
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Re: Muffler suggestions
You need bigger or longer mufflers.
Although personally I have never been told I need anything bigger or longer. Glass packs can be quite tame if you go for the longer ones while still having almost unrestricted flow. Personally I think Magna Flows are quieter at this point while still maintaining high flow. Although I have never done or seen a back to back test. You can get turbo style mufflers if the loss of a few hp does not bother you or you just like a little rumble. Also running the exhaust out the back have the effect of reducing cabin noise. Once again at the cost of almost 20 hp/tq vs dumped like you have it now. |
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12-26-2019, 08:06 PM
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#3 |
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Registered User
Join Date: Oct 2019
Location: Monaca, PA Western PA
Posts: 93
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Re: Muffler suggestions
Thank you.
I do like the side exhaust. I just dont have the funding to buy new mufflers to only find out they also are way to loud. I would like to keep what HP I have. |
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12-26-2019, 08:30 PM
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#4 |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,628
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Re: Muffler suggestions
What hp level do you think your at.
At the crank. |
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12-26-2019, 08:36 PM
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#5 |
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Registered User
Join Date: Oct 2019
Location: Monaca, PA Western PA
Posts: 93
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Re: Muffler suggestions
The Dyno sheet from Blueprint showed mid 430s. It does run very well, for all my needs.
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12-26-2019, 08:44 PM
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#6 |
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Registered User
 
Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,210
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Re: Muffler suggestions
check out this youtube video. https://www.hotrod.com/articles/engi...ers-episode-17 It may help your decision.
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Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
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12-27-2019, 12:56 AM
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#7 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,677
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Re: Muffler suggestions
If you really want to tame the exhaust, put a pair of Cadillac mufflers on it. You ever heard a Cadillac roar by when it passed you? Nope!?
 One Caddy muffler tames a 500 CI engine! Two of them will do you nicely. It's what I'm going to do when I go through my exhaust, if I live that long, since it may be many years before I do it.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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12-27-2019, 01:21 AM
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#8 |
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Post Whore
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,350
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Re: Muffler suggestions
The problem with Cadillac mufflers is they don't come in 3" diameter. Do you have room for longer glass packs? That is what I am using on my Burban in a 2 1/2" diameter and it is one of the quietest rigs I have built. I too have the pipes exiting in front of the rear wheels.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 Last edited by HO455; 12-27-2019 at 01:28 AM. |
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12-27-2019, 10:43 AM
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#9 |
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Registered User
Join Date: Nov 2014
Location: Dickinson, ND
Posts: 197
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Re: Muffler suggestions
I am running Magna flows on a Big Block with short headers, all 3" pipe and have the turn outs right in front of the rear tires. This configuration sounds great. Has a very nice rich and deep tone. You know the truck is running, but its not annoying.
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12-27-2019, 12:51 PM
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#10 |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,628
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Re: Muffler suggestions
I forgot to add if you get resonators they sure help out with sound. Especially drone at highway speeds.
But the biggest or longest magna flow would be my first step to fixing your sound level issues. |
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12-27-2019, 03:12 PM
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#11 |
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Registered User
Join Date: Feb 2011
Location: Parkville, MD
Posts: 1,024
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Re: Muffler suggestions
I've always really like the turbo mufflers. They are rather tame. Loud enough for me, but quiet enough I can start it up at 6 am.
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1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z |
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12-27-2019, 06:54 PM
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#12 |
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70+ ( Old Skool Club )
Join Date: Nov 2003
Location: Saskatoon, Saskatchewan ,Canada
Posts: 9,143
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Re: Muffler suggestions
Put a pair of these Dynomax Super Turbos on my bone stock 350/350 combo in my 72 C10 with pipes all the way to the back with pipes exiting behind the back wheels. I used 2 1/4 pipes but you can get 2 1/2's with these too. I cant post video on here, from my computer, cause you could hear them on the truck. Pic shows where I have exhaust exiting and its the same for both sides. PM me an email address and I'll send you video of my truck running if yu want to hear it.
http://www.dynomax.com/catalogsearch/result/?q=17747
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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12-27-2019, 08:33 PM
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#13 |
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Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,939
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Re: Muffler suggestions
I like Borla
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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12-28-2019, 09:03 PM
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#14 |
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Registered User
Join Date: Jan 2018
Location: TN
Posts: 104
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Re: Muffler suggestions
I have the flow master 44s over the axle and they sound great. Nice rumble but tame in the cab.
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1969 C10 Suburban Custom (Factory 396/TH400, survivor with no rust) |
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12-28-2019, 09:28 PM
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#15 | |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,677
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Re: Muffler suggestions
Quote:
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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12-28-2019, 09:40 PM
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#16 |
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Registered User
Join Date: Aug 2010
Location: Jennings, OK
Posts: 322
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Re: Muffler suggestions
On my 57 3200 I am running a set of flow master 50 series and they dump on the ground just in front of the axle. Sound is awesome and not too loud but very noticeable.
On my 1972 Camaro I am running a set of flow master 40 series, they exit out the back of the car and are somewhat louder but not obnoxious and have that muscle car rumble. Pretty sure both of these mufflers are available for a 3" exhaust system.
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Somehow, the idiots survive despite their best efforts to kill themselves. - dcozzi |
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