The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 08-24-2019, 04:23 PM   #1
focusedontheprize
Registered User
 
focusedontheprize's Avatar
 
Join Date: Feb 2012
Location: CA
Posts: 846
Quiet exhaust system for 454

Currently waiting on powder coating for my wheels to finish up my wheel/tire project. While I am waiting, moving on to the next project.

The truck currently has a 7.4L 454 with long tube headers and Flowmasters. They exit right under the rear seats and the exhaust does not extend to the back unfortunately. The exhaust is WAY too loud for a daily driver for me and I will be changing it.

I am going back to stock exhaust manifolds and have been looking at the Flowmaster 70 Series vs. Flowmaster 50 Series Big Block mufflers. Has anyone had any experience with either of these?
focusedontheprize is offline   Reply With Quote
Old 08-24-2019, 04:38 PM   #2
mongocanfly
Post Whore

 
mongocanfly's Avatar
 
Join Date: May 2015
Location: Alabama
Posts: 14,670
Re: Quiet exhaust system for 454

getting the pipes out the back will help a lot
__________________
Mongo...aka Greg

RIP Dad
RIP Jesse

1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598
Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334
Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563
2023 Chevy Z71..daily driver
mongocanfly is offline   Reply With Quote
Old 08-24-2019, 05:48 PM   #3
focusedontheprize
Registered User
 
focusedontheprize's Avatar
 
Join Date: Feb 2012
Location: CA
Posts: 846
Re: Quiet exhaust system for 454

Quote:
Originally Posted by mongocanfly View Post
getting the pipes out the back will help a lot
I would absolutely agree and am looking forward to that.
focusedontheprize is offline   Reply With Quote
Old 08-24-2019, 06:08 PM   #4
sweetk30
Registered User
 
sweetk30's Avatar
 
Join Date: May 2012
Location: horseheads,ny rust belt
Posts: 2,794
Re: Quiet exhaust system for 454

i run walker quiet flow s.s muffler now and its almost stock quiet .
__________________
77-k30lb BIG truck build .
87-k30lb budget beater build .
85-k30lb the plow machine build .
85-c10sb summer fun toy .
-----------------------------
HOLLEY SNIPER efi = worst case of p.i.t.a i ever had .

EDELBROCK pro flo 4 = best deal going so far . love my setup works great.
sweetk30 is offline   Reply With Quote
Old 08-24-2019, 07:44 PM   #5
mongocanfly
Post Whore

 
mongocanfly's Avatar
 
Join Date: May 2015
Location: Alabama
Posts: 14,670
Re: Quiet exhaust system for 454

I've got a set of walkers as well...still in the box though
__________________
Mongo...aka Greg

RIP Dad
RIP Jesse

1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598
Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334
Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563
2023 Chevy Z71..daily driver
mongocanfly is offline   Reply With Quote
Old 08-24-2019, 08:03 PM   #6
Ziegelsteinfaust
Registered User
 
Join Date: Dec 2012
Location: Temple City
Posts: 3,628
Re: Quiet exhaust system for 454

20 years ago almost I had a healthy 460 with 425hp/475tq roughly, and I used 4 Cherry Bomb long glass packs. Off the headers I used a Y fitting on each side. So each bank had two mufflers in parallel.

It was a absolute b-word to get set up with a H pipe, but most people thought I was rocking a nice 302. Guys who knew about cars usually said 351. So it fooled quite a few people.

Exhaust dampening is about exhaust volume, and the 4 mufflers provided a lot at a cheap price point.

So I would run 3" exhaust with the biggest packed muffler you can get. Or you can try the exhaust system I tried.
Ziegelsteinfaust is offline   Reply With Quote
Old 08-24-2019, 09:01 PM   #7
blazer2007
Registered User
 
Join Date: Jan 2007
Location: vernon b.c.
Posts: 3,022
Re: Quiet exhaust system for 454

I had the same problem with a healthy 454 in my Blazer and couldn,t stand it with some nice stock style turbo mufflers exiting in fr. of rear tires.I made it full exhaust out the back and now I don,t mind driving it without everyone looking at me. I think best choice is full exhaust.
blazer2007 is offline   Reply With Quote
Old 08-25-2019, 06:57 AM   #8
LT7A
Registered User
 
Join Date: Oct 2015
Location: PNW
Posts: 3,626
Re: Quiet exhaust system for 454

I have the FM 50 on my Trans Am and it sounds fantastic. I'm not given to overstating things or giving myself props, but if you want to hear your motor, it sounds great. I had a FM 70 on a TBI truck and it was toooo quiet. I swapped it out to an FM 50 and it was perfect. Then I went to a high flow cat and it is now a little too loud. Probably you want the 70s. The 50s sound good but are pretty aggressive. If I was doing it, I'd run 50s with adding the pipes out the back. And just to confuse the issue and possibly discredit my whole post -- both vehicles are 350s not big blocks. In addition, they both have stock manifolds. I thought I'd chime in because I have experience with the two series you asked about. Tell us what you choose and how you like it in the end!

Last edited by LT7A; 08-25-2019 at 07:06 AM.
LT7A is offline   Reply With Quote
Old 08-25-2019, 07:35 AM   #9
dieseldawg142
Registered User
 
dieseldawg142's Avatar
 
Join Date: Jul 2011
Location: back 40, bc
Posts: 3,906
Re: Quiet exhaust system for 454

went thru 4 sets of mufflers for my 454 before it got to where i could stand it, but still enjoy the sound.
i too have long tube headers, but run 3" pipes.
started out with magnaflows, could barely hear myself, with a full exhaust.
switched to flowmaster 40's, cause they were on my small block '68 910 and sounded nice.
they turned out to be just as loud as the magna's.
next was a set of 50 series, still waaay too loud for me.
for the last few yrs now i been running big block 70's and i like them. mostly quiet when not into the throttle, but still barks when i step on it.
dieseldawg142 is offline   Reply With Quote
Old 08-25-2019, 12:55 PM   #10
focusedontheprize
Registered User
 
focusedontheprize's Avatar
 
Join Date: Feb 2012
Location: CA
Posts: 846
Re: Quiet exhaust system for 454

Thanks everyone. I am leaning toward the Flowmaster 70 Series at the moment. It is a project that is next in line so I need to make a decision soon.

Just to be clear, when I am referring to the 50 series, Flowmaster makes a 50 Series Big Block that is quieter than the 70 series.
focusedontheprize is offline   Reply With Quote
Old 08-25-2019, 12:57 PM   #11
focusedontheprize
Registered User
 
focusedontheprize's Avatar
 
Join Date: Feb 2012
Location: CA
Posts: 846
Re: Quiet exhaust system for 454

Quote:
Originally Posted by dieseldawg142 View Post
went thru 4 sets of mufflers for my 454 before it got to where i could stand it, but still enjoy the sound.
i too have long tube headers, but run 3" pipes.
started out with magnaflows, could barely hear myself, with a full exhaust.
switched to flowmaster 40's, cause they were on my small block '68 910 and sounded nice.
they turned out to be just as loud as the magna's.
next was a set of 50 series, still waaay too loud for me.
for the last few yrs now i been running big block 70's and i like them. mostly quiet when not into the throttle, but still barks when i step on it.
Do you find the 70 Series to be closer to stock or still pretty aggressive? The objective for me is to keep the truck quiet (as this is my daily driver I leave my house very early in the morning and come home late at night) while still having great flow. Do you wish they were a little quieter or they are a good fit?
focusedontheprize is offline   Reply With Quote
Old 08-25-2019, 01:33 PM   #12
44th Miss Inf
Registered User
 
Join Date: Sep 2002
Location: Liberty, Mississippi
Posts: 672
Re: Quiet exhaust system for 454

If you want quiet and high flow, look into Donaldson mufflers
44th Miss Inf is offline   Reply With Quote
Old 08-26-2019, 12:53 PM   #13
JesseA422
Registered User
 
Join Date: Feb 2019
Location: NE
Posts: 16
Re: Quiet exhaust system for 454

if u have motortrend, the latest episode of engine masters is a muffler shootout on the dyno with tons of different ones.
JesseA422 is offline   Reply With Quote
Old 08-26-2019, 05:05 PM   #14
DieselSJ
Registered User
 
Join Date: Jun 2016
Location: Phoenix, AZ
Posts: 574
Re: Quiet exhaust system for 454

I'm running a 3" to a huge Magnaflow and it is nice and quiet.
__________________
87 R30 CC Dually, TBI 454, NV4500, zero rust barn find
87 Jeep Grand Wagoneer, 6.5 turbodiesel, 700R4
DieselSJ is offline   Reply With Quote
Old 08-26-2019, 10:54 PM   #15
focusedontheprize
Registered User
 
focusedontheprize's Avatar
 
Join Date: Feb 2012
Location: CA
Posts: 846
Re: Quiet exhaust system for 454

Thanks everyone. Great responses and this has been really helpful.
focusedontheprize is offline   Reply With Quote
Old 08-26-2019, 11:51 PM   #16
dieseldawg142
Registered User
 
dieseldawg142's Avatar
 
Join Date: Jul 2011
Location: back 40, bc
Posts: 3,906
Re: Quiet exhaust system for 454

Quote:
Originally Posted by focusedontheprize View Post
Do you find the 70 Series to be closer to stock or still pretty aggressive? The objective for me is to keep the truck quiet (as this is my daily driver I leave my house very early in the morning and come home late at night) while still having great flow. Do you wish they were a little quieter or they are a good fit?
not close to stock sounding with headers and 3" pipes....and my 454 is not stock either, but it has a nice low rumble at idle (you can tell it's definitley not stock) and light throttle. if i lay into it, they get a little louder and sound really nice, but not obnoxious loud. after going threw a butt-load of muffs, quite happy with the 70's.
three inch pipes will make it a bit louder, and as my truck is a crew, the pipes are completely straight for about 6 or 7 feet to the rear axle, no corners to knock down the sound levels.
and the 50 series i ran were big blocks, and no way in hay were they quieter than the 70's.
i went with the 50's over the 70's first cause i wanted good flow and nice sound, but like i said, waaay loud...
dieseldawg142 is offline   Reply With Quote
Old 08-27-2019, 02:10 PM   #17
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,634
Re: Quiet exhaust system for 454

Quote:
Originally Posted by DieselSJ View Post
I'm running a 3" to a huge Magnaflow and it is nice and quiet.
Perfect if it is a single 3'' pipe. Did the same on my flat bed and my pick-up, healthy sound without being annoying
kwmech is offline   Reply With Quote
Old 08-27-2019, 02:19 PM   #18
MalibuSSwagon
Registered User
 
Join Date: Sep 2009
Location: Weare,NH
Posts: 1,592
Re: Quiet exhaust system for 454

2.5in pipes from the manifolds to a large Magnaflow 18" body, 24" overall muffler with single 3in out, exiting behind the rear wheel. Sounds awesome outside, but inside is quiet, no drone. Guys think it's a rowdy small block with headers, but really it's a stock 5.3L with manifolds lol. Love driving the truck with that exhaust.
MalibuSSwagon is offline   Reply With Quote
Old 08-27-2019, 04:52 PM   #19
SCOTI
Registered User
 
SCOTI's Avatar
 
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,066
Re: Quiet exhaust system for 454

I have Dynomax brand 'Super Turbos' under my dually.

The system is:
461/OE heads/RV cam
1 3/4" long tube car headers
Dual 3" head pipes w/a 3" 'H' pipe
3" in/out Dynomax turbo mufflers
2.5" tailpipe reducers
2.5" dual tailpipes that angle down/out @ the rear bumper brackets

All tubing after the headers is .065" wall SS. The 3>2.5" transition is immediately after exiting the mufflers which is right @ the back of the cab (CC). It's pretty quiet IMO. The big-block rumble/vibration can still cause car alarms to go off as you pass by if in an apartment complex or a corridor but my dually is 5" off the ground @ ride height

I bought these mufflers based on internet searches using the key words: 'best flowing/quietest mufflers' for my search. I came across multiple muffler comparison tests & reviewed common mufflers from the various tests. My priorities were the best flowing quiet mufflers.

Testing indicated the Super Turbos flowed as good as Borla race mufflers (which were the loudest/2nd to open headers) but were as quiet as OE mufflers (OE were listed as quietest w/the Dynomax as next in line). The testing results that I liked which seemed most informative was from a Pontiac magazine article & was based off of a warmed over 455 equipped wagon that had a 2 into 1 2.5" exhaust arrangement. 'Real world' testing results were on a drag strip which included the track times, sound levels @ cruise rpm & WOT. Since the Dynomax Super Turbos did so well vs. the other more popular brand-X mufflers in the 2.5" version I just got the same mufflers in the largest version I could find (length) in 3" in/out.

Pretty happy with the choice. I plan to get the same ones in 2.5" for my 64 if I don't like the ones it has (I had already acquired them for it before I did my research for the dually set-up).
Attached Images
  
__________________
67SWB-B.B.RetroRod
64SWB-Recycle
89CCDually-Driver/Tow Truck
99CCSWB Driver
All Fleetsides
@rattlecankustoms in IG

Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.....

Cubic inches is like Indiana Jones with a cheap pistol.

Last edited by SCOTI; 08-27-2019 at 04:58 PM.
SCOTI is offline   Reply With Quote
Old 08-27-2019, 06:43 PM   #20
tucsonjwt
Registered User
 
Join Date: Jul 2007
Location: Tucson, AZ
Posts: 3,189
Re: Quiet exhaust system for 454

I have just stock mufflers on my 83 C20 454 and it is very quiet. The PO extended the pipes out the sides behind the rear wheel wells and it is still quiet. Pipes straight out the back is the standard configuration, but I like the side exit better and it is probably cheaper. My guess is that Midas did the exhaust since it has Midas mufflers, and the mufflers have no rust or leaks in the 17 years I have owned the truck. Of course, no salt in So. AZ desert.
tucsonjwt is offline   Reply With Quote
Old 08-28-2019, 10:52 AM   #21
blazer2007
Registered User
 
Join Date: Jan 2007
Location: vernon b.c.
Posts: 3,022
Re: Quiet exhaust system for 454

Quote:
Originally Posted by SCOTI View Post
I have Dynomax brand 'Super Turbos' under my dually.

The system is:
461/OE heads/RV cam
1 3/4" long tube car headers
Dual 3" head pipes w/a 3" 'H' pipe
3" in/out Dynomax turbo mufflers
2.5" tailpipe reducers
2.5" dual tailpipes that angle down/out @ the rear bumper brackets

All tubing after the headers is .065" wall SS. The 3>2.5" transition is immediately after exiting the mufflers which is right @ the back of the cab (CC). It's pretty quiet IMO. The big-block rumble/vibration can still cause car alarms to go off as you pass by if in an apartment complex or a corridor but my dually is 5" off the ground @ ride height

I bought these mufflers based on internet searches using the key words: 'best flowing/quietest mufflers' for my search. I came across multiple muffler comparison tests & reviewed common mufflers from the various tests. My priorities were the best flowing quiet mufflers.

Testing indicated the Super Turbos flowed as good as Borla race mufflers (which were the loudest/2nd to open headers) but were as quiet as OE mufflers (OE were listed as quietest w/the Dynomax as next in line). The testing results that I liked which seemed most informative was from a Pontiac magazine article & was based off of a warmed over 455 equipped wagon that had a 2 into 1 2.5" exhaust arrangement. 'Real world' testing results were on a drag strip which included the track times, sound levels @ cruise rpm & WOT. Since the Dynomax Super Turbos did so well vs. the other more popular brand-X mufflers in the 2.5" version I just got the same mufflers in the largest version I could find (length) in 3" in/out.

Pretty happy with the choice. I plan to get the same ones in 2.5" for my 64 if I don't like the ones it has (I had already acquired them for it before I did my research for the dually set-up).
does it have that loud rapping noise when you step on the gas ? don,t care for that noise like some of the other mufflers
blazer2007 is offline   Reply With Quote
Old 08-28-2019, 11:53 AM   #22
daddyjeep
Registered User
 
daddyjeep's Avatar
 
Join Date: Nov 2015
Location: Smethport, PA
Posts: 1,213
Re: Quiet exhaust system for 454

I am running dual 2 1/2" Cherry Bomb turbo mufflers behind my 454. My research said that they were about the only turbo style muffler that didn't drone at some point in the RPM range. My only complaint with them is that they could be a little louder. They exit in front of the rear tires and are really pretty quiet.

Lets see if this video link works.

https://drive.google.com/uc?id=1BQGi...zreMcklfRv1Xtc
__________________
85 K30 crew cab dually - Project http://67-72chevytrucks.com/vboard/s...d.php?t=694939
87 Wrangler Rock Crawler - Reason for the project http://www.wranglerforum.com/f330/da...ld-122601.html
04 1500 crew cab
http://67-72chevytrucks.com/vboard/s...d.php?t=786514

Last edited by daddyjeep; 08-28-2019 at 12:04 PM.
daddyjeep is offline   Reply With Quote
Old 08-28-2019, 01:18 PM   #23
SCOTI
Registered User
 
SCOTI's Avatar
 
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,066
Re: Quiet exhaust system for 454

Quote:
Originally Posted by blazer2007 View Post
does it have that loud rapping noise when you step on the gas ? don,t care for that noise like some of the other mufflers
The blapblapblapblapblapblapblap noise from almost every Charger, Challenger, 5.0, or Camaro? No, it doesn't sound like that. Sounds like a quiet turbo style muffler to me.
__________________
67SWB-B.B.RetroRod
64SWB-Recycle
89CCDually-Driver/Tow Truck
99CCSWB Driver
All Fleetsides
@rattlecankustoms in IG

Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive.
It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.....

Cubic inches is like Indiana Jones with a cheap pistol.
SCOTI is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 09:36 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com