Quiet the exhaust a little

Paul_G

Well-Known Member
Local time
6:18 PM
Joined
Dec 24, 2013
Messages
1,902
Reaction score
2,999
Location
Surprise, Arizona
My 73 has a 383 engine with a little bit of cam in it, 230 duration 480 lift cam, long tube headers, a new 2 1/2" full exhaust with X pipe, and an old pair of Cherry Bomb turbo mufflers. I have used sound prevention and heat insulation material on the floors and roof. On the highway the car is still too loud inside to cruise long distances comfortably. A lot of it is wind noise I know. I would like it a bit quieter.

I dont know if the Cherry Bombs are the entire cause, if changing to different mufflers will help? Adding resonators? Just would prefer not to totally restrict it if possible.
 

Don Frelier

FBBO Gold Member
FBBO Gold Member
Local time
9:18 PM
Joined
Oct 11, 2016
Messages
5,939
Reaction score
7,727
Location
Ionia, NY
I like Hemi mufflers and make sure the exhaust/tailpipes extend beyond the rear bumper.
 

Ron H

FBBO Gold Member
FBBO Gold Member
Local time
8:18 PM
Joined
Feb 29, 2016
Messages
7,151
Reaction score
7,956
Location
WI
Was just resurfacing an old thread on this yesterday, you should look it up as a lot of members posted good info. I liken muffler selection to reading a menu at a Greek restaurant! Endless selections. My car has headers, 3" with X pipe - the 3" would be necessary if my ride was pumping 100 more HP. Anyway it has Flowmasters - sounds really neat; but way loud. Some members suggested ESC (or ECS?) or Accurate exhaust for factory style/sound so I'm looking at those now. The former is way pricy but members say they like 'em a lot. There's so many brands (made a long list) but don't want to end up with something too close to what I have on it...so looks like one or the other with me...
 

Dan64

Well-Known Member
Local time
9:18 PM
Joined
Dec 27, 2018
Messages
1,634
Reaction score
1,819
Location
East coast
I would lose the cherry bombs and look at DynoMax super turbos, they're on the quiet side but not to quiet.
 

furious70

Well-Known Member
Local time
8:18 PM
Joined
Jun 30, 2020
Messages
916
Reaction score
516
Location
Chicagoland
Do you have full tail pipes? Best move to reduce inside noise
 

hunt2elk

FBBO Gold Member
FBBO Gold Member
Local time
8:18 PM
Joined
Jul 15, 2009
Messages
8,951
Reaction score
8,606
Location
WI
2.5" Dynomax Superturbo's are a nice muffler. Not loud, no drone.
 

PurpleBeeper

Well-Known Member
Local time
8:18 PM
Joined
Mar 20, 2011
Messages
4,917
Reaction score
3,660
Location
Chicago
I've run MANY cars with cherry bombs, no mufflers, open headers (cops loved that)....but now, good old stock Walker or other "stock type" mufflers for me. If you want "no restriction" put a set of electric cutouts on it (seriously)
 

451Mopar

Well-Known Member
Local time
7:18 PM
Joined
Oct 25, 2011
Messages
3,146
Reaction score
2,429
Location
Aurora, CO
The Dynomax superturbo mufflers are fairly quiet and flow pretty good. Also not that expensive.
A stock replacement type muffler will be fairly quiet, but usually are 2-1/4" in/out.
 

kramer

Well-Known Member
Local time
6:18 PM
Joined
Aug 20, 2019
Messages
113
Reaction score
178
Location
Its Vegas baby
Dynomax superturbo mufflers for me they have good sound and not too loud and no drone while driving down the road.
 

BLK 68 R/T

Well-Known Member
Local time
6:18 PM
Joined
Jan 10, 2016
Messages
1,667
Reaction score
3,454
Location
Dayton, WA
Adding some resonators in the tailpipes will help quiet it down a bunch as well.
 

747mopar

Well-Known Member
Local time
8:18 PM
Joined
Oct 30, 2012
Messages
13,516
Reaction score
18,279
Location
ohio
I don't know that muffler selection always eliminates drone? I had Flowmasters once.. bad drone so I decided on a traditional glass packed oval muffler for my current ride much like a Dynomax, no drone until I went from side exit to full length? Seems there's some science to it? I've had exhaust drone before that simply securing the exhaust better cured.. don't know? Myself I'll be adding resonators. I also can't help but notice nearly all modern cars come with both mufflers and resonators.
 

33 IMP

FBBO Gold Member
FBBO Gold Member
Local time
6:18 PM
Joined
Dec 21, 2017
Messages
7,878
Reaction score
11,142
Location
taxifornia,soon 2b Arizona.
You have triple pass turbos now. That is what lots of people who have straight thru or flowmasters that are too loud go TO.
If you want it quieter, you will probably have to go to a physically larger triple pass (hemi muffler, or walker quiet power), and keep the same size pipe for good flow, or...
add a pair of resonators in the tailpipes. Kinda depends on how much room you have for the resonators.
 

69a100

Well-Known Member
Local time
8:18 PM
Joined
Aug 22, 2012
Messages
10,488
Reaction score
14,817
Location
The Real World
It's funny, your build is close to mine! 383 with a 23/30 on a .505+ lift with stock manifolds, 2-1/4", no X, with cherry bomb Vortex's on them and it has a cool sound to me, maybe it's the smaller pipes? I also don't have all the deading material that you do, and I'm comfortable on the H-way with it as is. The Hemi or the D-max as above would work good too. Good Luck
 

Ron H

FBBO Gold Member
FBBO Gold Member
Local time
8:18 PM
Joined
Feb 29, 2016
Messages
7,151
Reaction score
7,956
Location
WI
Anyone recall offhand what brand mufflers mopar put on their cars? I recall my '70 Cuda and '73 Challenger had pretty quiet exhaust (actually back in my younger days too quiet for me) both had large resonators on them. Resonators on mine would make sense ('63 Ply) but no room for those running along the fuel tank (3" pipes).
 

That_Tall_Dude

Well-Known Member
Local time
6:18 PM
Joined
Apr 16, 2018
Messages
220
Reaction score
263
Location
NorCal
I read on here someone mentioning about x-pipe equalizing the exhaust pulses

And they can come out out at the same time increase exhaust noise/drown, and suggested having differing mufflers to address it

might just try one muffler change at a time and drive it, see if that’s a thing
(if you get other mufflers and are doing the install yourself)

will see if I can find it
 

Ron H

FBBO Gold Member
FBBO Gold Member
Local time
8:18 PM
Joined
Feb 29, 2016
Messages
7,151
Reaction score
7,956
Location
WI

CMCE

Member
Local time
9:18 PM
Joined
Jan 31, 2019
Messages
22
Reaction score
12
Location
PA
Those sound awesome - but not sure how much quieter those will be than my Flowmasters.
Which Flowmasters do you have? WW2 was quieter than FM 40's. Super 50's are fairly quiet, and they still have the FM tone. I have 20" Super Turbo's on a 406 Chevelle, and they are very quiet. They will let you know if your weather-stripping needs to be replaced.
 

Ron H

FBBO Gold Member
FBBO Gold Member
Local time
8:18 PM
Joined
Feb 29, 2016
Messages
7,151
Reaction score
7,956
Location
WI
Which Flowmasters do you have? WW2 was quieter than FM 40's. Super 50's are fairly quiet, and they still have the FM tone. I have 20" Super Turbo's on a 406 Chevelle, and they are very quiet. They will let you know if your weather-stripping needs to be replaced.
Thanks - can't recall right off which I have - have to check - lol mine let you know even with weather stripping!
 

Top