Re: Multiple mufflers
[Re: hemienvy]
#2511173
06/21/18 01:55 AM
06/21/18 01:55 AM
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Joined: Aug 2003
Posts: 43,099
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,099
Bend,OR USA
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Typical dual exhaust / dual mufflers, exit out the back.
Say I add a Y-pipe on each side, and add one more identical
muffler per side (so 4 total), and so now have 4 tailpipes.
Will the new exhaust system have less backpressure and be louder,
or will it have less backpressure and be quieter ?  Do it and let us know   AKA, what diameter is your pipes from the manifolds or header collectors to the muffs and on back to the second set of muffs? I think of exhaust systems like electric circuit, resistors in electric circuit in series restricts the flow, resistors in parallel don't increase resistance to the flow  I think four muffs ran in parallel mounted at the rear bumper off of two Y pipes would flow the most and be the least noisy 
Last edited by Cab_Burge; 06/21/18 01:56 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Multiple mufflers
[Re: hemienvy]
#2511208
06/21/18 05:08 AM
06/21/18 05:08 AM
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Joined: Jan 2003
Posts: 2,915
A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,915
A shed in England
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I'd guess it would be quieter with less backpressure, the trade off is the extra weight. Likely you wouldn't see a performance increase if your system is already capable of handling your engine output. 
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Multiple mufflers
[Re: hemienvy]
#2511223
06/21/18 09:23 AM
06/21/18 09:23 AM
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Joined: Jan 2003
Posts: 17,918
Akron, Ohio
ProSport
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,918
Akron, Ohio
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I don't really feel it's necessary these days with all the muffler options and crossover pipes. An X-pipe and good set of mufflers can be pretty quiet, especially if it has tailpipes.
My 9 second DartSport had 3.5"pipes, X-pipe, Magnaflow stainless race mufflers and the pipes exited on the side right in front of the rear tires.
People would tell me they thought I coasted into the staging lanes because they couldn't hear it.
My current mid 10 sec street car has 3" pipes, H-pipe, Jones stainless straight-through mufflers, and 2.5" tailpipes.
It is very quiet and I love the sound. But I do have electric cutouts for fun and track time. I haven't made a pass yet with the cutouts closed.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: Multiple mufflers
[Re: ProSport]
#2511234
06/21/18 10:06 AM
06/21/18 10:06 AM
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Joined: Jan 2003
Posts: 13,351
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,351
Marion, South Carolina [><]
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I don't really feel it's necessary these days with all the muffler options and crossover pipes. An X-pipe and good set of mufflers can be pretty quiet, especially if it has tailpipes.
My 9 second DartSport had 3.5"pipes, X-pipe, Magnaflow stainless race mufflers and the pipes exited on the side right in front of the rear tires.
People would tell me they thought I coasted into the staging lanes because they couldn't hear it.
My current mid 10 sec street car has 3" pipes, H-pipe, Jones stainless straight-through mufflers, and 2.5" tailpipes.
It is very quiet and I love the sound. But I do have electric cutouts for fun and track time. I haven't made a pass yet with the cutouts closed.  I was shocked at how quiet my car was when I first put on the 4" Hooker Max Flow mufflers. They are straight through, like a Dynomax Ultraflow, but are real quiet at idle and part throttle. I have an H pipe and dumps at the axle. Have not done a back to back test yet, but it's run real close to what it has w/ just a pair of 4" race bullets on the collectors. 
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Multiple mufflers
[Re: an8sec70cuda]
#2511900
06/22/18 08:57 PM
06/22/18 08:57 PM
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Joined: Jan 2003
Posts: 17,918
Akron, Ohio
ProSport
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,918
Akron, Ohio
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I don't really feel it's necessary these days with all the muffler options and crossover pipes. An X-pipe and good set of mufflers can be pretty quiet, especially if it has tailpipes.
My 9 second DartSport had 3.5"pipes, X-pipe, Magnaflow stainless race mufflers and the pipes exited on the side right in front of the rear tires.
People would tell me they thought I coasted into the staging lanes because they couldn't hear it.
My current mid 10 sec street car has 3" pipes, H-pipe, Jones stainless straight-through mufflers, and 2.5" tailpipes.
It is very quiet and I love the sound. But I do have electric cutouts for fun and track time. I haven't made a pass yet with the cutouts closed. I was shocked at how quiet my car was when I first put on the 4" Hooker Max Flow mufflers. They are straight through, like a Dynomax Ultraflow, but are real quiet at idle and part throttle. I have an H pipe and dumps at the axle. Have not done a back to back test yet, but it's run real close to what it has w/ just a pair of 4" race bullets on the collectors. Sounds like a good setup Chip, let us know how the back to back test goes if you get time to do one.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: Multiple mufflers
[Re: ProSport]
#2511916
06/22/18 09:42 PM
06/22/18 09:42 PM
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Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
cudadoug
master
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master
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
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I don't really feel it's necessary these days with all the muffler options and crossover pipes. An X-pipe and good set of mufflers can be pretty quiet, especially if it has tailpipes.
My 9 second DartSport had 3.5"pipes, X-pipe, Magnaflow stainless race mufflers and the pipes exited on the side right in front of the rear tires.
People would tell me they thought I coasted into the staging lanes because they couldn't hear it.
My current mid 10 sec street car has 3" pipes, H-pipe, Jones stainless straight-through mufflers, and 2.5" tailpipes.
It is very quiet and I love the sound. But I do have electric cutouts for fun and track time. I haven't made a pass yet with the cutouts closed. Tailpipes ending where? All the way to the bumper, behind the tire...or...??
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Re: Multiple mufflers
[Re: hemienvy]
#2512063
06/23/18 08:59 AM
06/23/18 08:59 AM
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Joined: Jan 2003
Posts: 17,918
Akron, Ohio
ProSport
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,918
Akron, Ohio
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CudaDoug, my 2.5" tailpipes are one inch past the back bumper with 3.5" exhaust tips.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: Multiple mufflers
[Re: ProSport]
#2512765
06/24/18 09:48 PM
06/24/18 09:48 PM
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Joined: Dec 2004
Posts: 10,551
Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,551
Rittman Ohio
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CudaDoug, my 2.5" tailpipes are one inch past the back bumper with 3.5" exhaust tips. I was thinking of running 2.5" pipes out from my 3" mufflers to the bumper. I have 3.5" collectors to 3" pipes to 3" 2 chamber old Flowmasters. I have a new set of GIANT Dynomax super turbos that I am going to install this year. I really don't think the restriction would be that bad after the mufflers Back to the OP's question I think a small bullet resonator before the tailpipe would take the snap out of the exhaust note Gus 
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
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