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Straight Through Type Mufflers On Street #1591922
03/12/14 02:30 PM
03/12/14 02:30 PM
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Indiana
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YO7_A66 Offline OP
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For those of you running straight through style mufflers on the street, do you have any resonance at cruising speeds?
If so, did you have to run a second muffler/resonator to try to get rid of the resonance or noise of the exhaust?
Is one of these mufflers per side too loud for a street car?


Note: I am planning on changing my exhaust to a straight through 2.5" system and I am considering using two straight through type mufflers in the rear. But I have read that this can be noisy for a street car and this can cause resonance due to the louder type of muffler. Some cases a second muffler/resonator might be required under the rear seat for the noise and resonance. If so, then I was looking at another straight through style muffler for this issue.

Thanks

Re: Straight Through Type Mufflers On Street [Re: YO7_A66] #1591923
03/12/14 03:44 PM
03/12/14 03:44 PM
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Bend,OR USA
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Cab_Burge Online work
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I ran a set of Magnaflow 14x7x 3 inch in and out on my pump gas street Duster, they where mounted behind the rear end between the 1/4 panel and rear sub frames, exited at the rear bumper I did have three inch pipes straight from the headers to the muffs, no resonators, nice sound at part throttle cruise No droning that I remember, they where a lot louder at WOT I raced that car a lot, it would pickup only .004 ET and .2MPH in the 1/8 mile by removing the exhaust from the headers back, probally the weight saving and not a reduction in back pressure making the gains My next street car will probally have a set of Ultaflow 3.5 inch muffs and pipes on it


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Straight Through Type Mufflers On Street [Re: Cab_Burge] #1591924
03/12/14 08:32 PM
03/12/14 08:32 PM
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n.e. pa.
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65rbdodge Offline
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my 440 coronet has headers, 3" pipes w/ h pipe and dynomax ultra flows

my 400 dart has headers 2.5" pipes w/ x pipe and pypes race pro mufflers

both mufflers are straight through and neither have any droning/resonance

Re: Straight Through Type Mufflers On Street [Re: 65rbdodge] #1591925
03/12/14 09:04 PM
03/12/14 09:04 PM
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Brookeville, Md
Mr.Yuck Offline
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I have the summit 3" exhaust and their 3" welded mufflers. They are straight thru, no drone they are just always loud. Probably best to get the Dynomax's and be done.


[IMG]http://i66.tinypic.com/pui5j.jpg[/IMG]
Coming soon!!!!
Re: Straight Through Type Mufflers On Street [Re: YO7_A66] #1591926
03/12/14 09:04 PM
03/12/14 09:04 PM
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Benton, IL.
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DaveRS23 Offline
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On my 500" wedge with 3" exhaust, I run Dynomax straight thru mufflers ahead of the axle and cheap glass packs behind. The noise is acceptable for the street and it controls the drone while sounding a lot like these cars did in the 60s and 70s.

A lot of today's mufflers make our cars sound like rustangs and the like.


Master, again and still
Re: Straight Through Type Mufflers On Street [Re: DaveRS23] #1591927
03/13/14 08:34 AM
03/13/14 08:34 AM
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Indiana
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YO7_A66 Offline OP
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Thanks for the replies.

I have been leaning towards putting in the largest diameter/length 2-1/2" (appx: 6" diameter x 18" body) straight through muffler that will fit beside the tank and then test the sound. Then if it is still too loud, then add another one under the seat (appx: 4" diameter x 14/18" body) to settle it down.


Thanks again.


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: Straight Through Type Mufflers On Street [Re: YO7_A66] #1591928
03/13/14 11:20 AM
03/13/14 11:20 AM
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Bethel Ct
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AdamR Offline
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Id go with Ultraflows under the seats and bullets along the tank.

Re: Straight Through Type Mufflers On Street [Re: AdamR] #1591929
03/13/14 11:43 AM
03/13/14 11:43 AM
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Brookeville, Md
Mr.Yuck Offline
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summit welded in car https://www.youtube.com/watch?v=zd66H_kkzJg

https://www.youtube.com/watch?v=FUOKfx8jPX8 outside car. Yes that's an SLP Z28 I had to spot him a second.

Re: Straight Through Type Mufflers On Street [Re: AdamR] #1591930
03/13/14 01:14 PM
03/13/14 01:14 PM
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Indiana
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YO7_A66 Offline OP
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I am leaning towards the 6" diameter by 18" long bodied Magnaflow beside the tank. Then if required, I would look at the 4" diameter by 14"/18" long bodied Magnaflow as a resonator.

I attached one of the 6" verions for reference. I already measured and the 18" body should work beside the tank, it just depends on the tail pipe and I will buy it first before choosing the length of muffler. I want the longest muffler beside the tank that will fit.

Thanks to all.

8072551-MF126166x14.jpg (272 downloads)

1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: Straight Through Type Mufflers On Street [Re: YO7_A66] #1591931
03/13/14 06:31 PM
03/13/14 06:31 PM
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USA
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b54406barrel Offline
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I'll have to really dig but I think I still have a set of full size, 4" purple hornies I bought in 73. They'd be perfect!

Re: Straight Through Type Mufflers On Street [Re: b54406barrel] #1591932
03/13/14 06:41 PM
03/13/14 06:41 PM
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Indiana
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YO7_A66 Offline OP
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I had never heard of those, so I had to look them up.

8072844-PHM.jpg (305 downloads)

1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: Straight Through Type Mufflers On Street [Re: YO7_A66] #1591933
03/13/14 06:50 PM
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b54406barrel Offline
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Those aren't the full size one's. Those are cadillac quiet compared to the first series. I had them on 69 bb camaro with a ZL-1 cam, off 2-1/8 tube cyclones. . It would rattle all the glassware around the counter at the local A&W.
Too many tickets so they had to come off.

Last edited by b54406barrel; 03/13/14 06:52 PM.
Re: Straight Through Type Mufflers On Street [Re: YO7_A66] #1591934
03/13/14 08:11 PM
03/13/14 08:11 PM
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South San Francisco, Californi...
MidPenMopar Offline
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I have just a set of 30 inch glass packs on my roadrunner and I like the way it sounds. Its a totally different tone and not too loud even with my long tube headers. Oh and I got rid of the drone at cruising speed too.

Re: Straight Through Type Mufflers On Street [Re: MidPenMopar] #1591935
03/13/14 08:11 PM
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Re: Straight Through Type Mufflers On Street [Re: YO7_A66] #1591936
03/13/14 09:11 PM
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Benton, IL.
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DaveRS23 Offline
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On the straight thru mufflers both length and diameter matter when it comes to noise level. A muffler style will be much quieter than a similar length bullet. And stay quiet longer, too.

What they call bullet today used to be called a glass pack, right?


Master, again and still
Re: Straight Through Type Mufflers On Street [Re: DaveRS23] #1591937
03/13/14 09:54 PM
03/13/14 09:54 PM
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Bethel Ct
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AdamR Offline
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Quote:


What they call bullet today used to be called a glass pack, right?




Pretty much

Re: Straight Through Type Mufflers On Street [Re: AdamR] #1591938
03/14/14 01:12 AM
03/14/14 01:12 AM
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Re: Straight Through Type Mufflers On Street [Re: YO7_A66] #1591939
03/14/14 03:11 AM
03/14/14 03:11 AM
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River Falls, WI
urdustd Offline
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Initially I had 2.5" head pipes, UltraFlows and 2.25" tails. Way too loud. You couldn't hear someone next to you speak. Added an h-pipe and it was much quiter. Sounded like the old muscle cars. I changed headers and also changed to an x-pipe. Even quiter than the H, but definitely changed the tone. I like the latest setup best. I do have a video of this too if you want to hear it.
I'll bet you will need a crossover or multiple muffs to make it tolerable.

Re: Straight Through Type Mufflers On Street [Re: urdustd] #1591940
03/14/14 08:55 AM
03/14/14 08:55 AM
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Indiana
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YO7_A66 Offline OP
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""I'll bet you will need a crossover or multiple muffs to make it tolerable.""

I thought of the largest straight through muffler in the rear (6 dia. x 14"/18"), then possibly the 4" dia x 18"/22" or so for a resonator, but I did not think of adding a possible crossover pipe. I am currently running each exhaust side seperately from each other. I will take some measurements to see what x-pipe might fit, just in case.

Thanks


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: Straight Through Type Mufflers On Street [Re: YO7_A66] #1591941
03/14/14 12:20 PM
03/14/14 12:20 PM
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pa.
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dan9 Offline
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Has anyone tried the chambered exhaust? I am curious what they sound like for a 340. They come in different sizes and lengths.

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