Re: Dynomax mufflers
[Re: Beep Beep]
#1837658
05/31/15 12:33 AM
05/31/15 12:33 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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are you after more free flowing to free up some HP which will be noisier or more restrictive to quiet your system some which generally costs some power? to ans your Q a longer muff will subject the gasses to more muffling which will be quieter assuming the longer muff will fit your vehicle. Just me I'd keep the Dynomax's (they're a good muff) and add some glasspacks alongside the rear leaf springs for addit'l quieting. with that plan make sure your choice of GP does not neck down where the end nipples are welded to the case
live every 24 hour block of time like it's your last day on earth
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Re: Dynomax mufflers
[Re: Beep Beep]
#1837694
05/31/15 01:30 AM
05/31/15 01:30 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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a straight thru would gain some over a "regular" type with a center nipple and an offset nipple. Not sure how much. I ain't an ex engineer but If I was serious & wanting to experiment, what I'd do to start is take a pressure reading in front and in the rear of the current muffs at WOT. Just WAG I think you'd notice the noise increase but not a performance increase. My pref is a restricted (quiet) system with open cutouts right at the collectors. with the money in a third parties' hand I open em up & 10 seconds later its all over but the cryin & the money is (now) in my hands then I close the cutouts
live every 24 hour block of time like it's your last day on earth
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Re: Dynomax mufflers
[Re: Beep Beep]
#1837715
05/31/15 02:10 AM
05/31/15 02:10 AM
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Joined: Mar 2005
Posts: 1,373 Rancho Cucamonga, CA
D_C
pro stock
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pro stock
Joined: Mar 2005
Posts: 1,373
Rancho Cucamonga, CA
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I have had Ultra Flow Welded (oval, 20-inch case) mufflers on my 71 Charger (440) and '79 CJ5 (AMC 304 V8) for over 10 years. I'm using 3-inch exhaust with H-Pipes. They do flow well (they should, as they are essentially glass packs) but are a bit noisy for constant street use.
I tried adding Dnomax bullet mufflers to the Charger (so, 4 - mufflers on one car), but it didn't help much with the noise level. Ear plugs are helpful on the freeway, else your ears will ring. I keep a set handy in the glove compartment.
Then again, a 2 1/2 inch system, all the way to the rear bumper, may help / be acceptable.
Seat of the pants, they DO seem to improve performance, but I haven't had either on a Dyno to verify by how much. The exhaust note while winding out, sounds (somewhat) like a Pro Stock engine.
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Re: Dynomax mufflers
[Re: 62maxwgn]
#1837823
05/31/15 10:32 AM
05/31/15 10:32 AM
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Joined: Jul 2003
Posts: 4,825 Holland MI Ottawa
2boltmain
master
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master
Joined: Jul 2003
Posts: 4,825
Holland MI Ottawa
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Your choice !
OEM..................................... ........................................ ...225 Gibson SuperFlow 788200.................................. ............311 TTS Bullet Cat Converter............................... ..................324 Flowmaster 40 series 42540................................... .......352 Flowmaster 50 Series.................................. ...................362 Flowmaster 40 series 43040................................... .......392 Dynomax Super Turbo................................... .................410 Flowmaster 62631................................... .......................435 Carsound Cat Converter............................... ..................436 FLP Cat Converter............................... ............................440 Edelbrock Victor 5535.................................... ..................562 Flowmaster 40 series 435409.................................. ........576 Edelbrock RPM series 5511.................................... ..........579 Flowmaster Delta Force Racing 54040-10........................634 Edelbrock 304 series 5560.................................... ...........640 Edelbrock Gen App 5505.................................... ..............708 Dynomax Race Magnum Welded 17216...........................711 Borla XR-1 40600................................... ..........................836 Borla XR-1 40615................................... ..........................854 Dynomax UltraFlow SS 17263................................... .......1000 Dynomax Race Magnum Welded 17218...........................1000 Borla XR-1 40575................................... ..........................1100 Dynomax UltraFlow............................... ...........................1133 Edelbrock Victor 5537.................................... ..................1400 Borla XR-1 40450................................... ..........................1400 Borla XR-1 40741................................... ..........................1450 Dynomax UltraFlow SS 17296, 17268..............................2200 Dynomax Race Magnum Welded 17220, 17224...............2200 Dynomax Race Magnum Welded 17225...........................2600 These are DECIBEL ratings?...........(joking)
Keep old mopars alive.
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Re: Dynomax mufflers
[Re: Beep Beep]
#1837824
05/31/15 10:36 AM
05/31/15 10:36 AM
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Joined: Jan 2003
Posts: 1,482 Lake Orion, MI
goldduster318
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,482
Lake Orion, MI
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I have the 2.5" TTI X-pipe system and the Dynomax welded ultra-flos in the short case on my car, with straight cut tips that exit and inch past the bumper and it's pretty quiet in the car. Rolling on the freeway at 70 (3000 rpm), I can hear the tire noise (and they aren't loud tires) over the exhaust. Other than pretty much right at 2000 rpm, they are pretty quiet. Not bad at all for mufflers you can see through.
'70 Duster 470hp 340/T56 Magnum/8 3/4 3.23 Sure-Grip
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Re: Dynomax mufflers
[Re: Beep Beep]
#1838031
05/31/15 03:16 PM
05/31/15 03:16 PM
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Joined: Jan 2003
Posts: 6,531 Jacksonville, FL
Chris2581
master
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master
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
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Anyone know what the Hooker max flow mufflers are rated at ??
Nautilus Racing- We use Superformance gaskets and Turbo Action converters/products.
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Re: Dynomax mufflers
[Re: Chris2581]
#1838280
05/31/15 10:51 PM
05/31/15 10:51 PM
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Joined: Jan 2003
Posts: 5,446 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,446
Indiana
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Chris 2342: I have found the Hooker 2.5" Max Flows are at the same flow rating as 2.5" pipe, 521cfm! I love the sound of mine!
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Dynomax mufflers
[Re: Beep Beep]
#1838345
06/01/15 12:30 AM
06/01/15 12:30 AM
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Joined: Jan 2003
Posts: 10,081 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,081
Frostbitefalls MN (Rocky&Bullw...
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For a sound reference, I put a pair of super turbos on my 318 Dart, with a 2 1/2 inch system and a cross over, and you can barely here it run. If they truly do flow 410 each, that would equal a zero loss at 364 hp, or 2 percent loss at 410 hp. Vizards book shows 2.25 cfm per open pipe hp equals no loss, 2 cfm equals 2 percent, 1.75 cfm equals a 5 percent loss. My next engine is going to be roughly 500 hp, so I am looking at a loss of about 8 percent, or 40 hp, but the car will be very quiet for what it is. The loss might even be less, as the mufflers are where the spare tire used to be, at the back of the car.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Dynomax mufflers
[Re: Beep Beep]
#1839633
06/02/15 12:18 PM
06/02/15 12:18 PM
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Joined: Jan 2003
Posts: 13,492 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,492
Marion, South Carolina [><]
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You will see a noticeable power increase after putting the Ultraflows on.
The Hooker Max Flows are almost the exact same style of muffler as the Dynomax Ultraflow and will perform the same. The Hooker Aerochamber is a little quieter and more restrictive than the Ultraflow or Max Flow, but performs way better than the Super Turbo.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '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: Dynomax mufflers
[Re: Beep Beep]
#1839991
06/02/15 08:49 PM
06/02/15 08:49 PM
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Joined: Feb 2007
Posts: 749 NY
Beep Beep
OP
super stock
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OP
super stock
Joined: Feb 2007
Posts: 749
NY
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That is what I am looking for more power! That is a nice muffler bearing. Lol
Last edited by Beep Beep; 06/02/15 08:49 PM.
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Re: Dynomax mufflers
[Re: Beep Beep]
#1840083
06/02/15 10:32 PM
06/02/15 10:32 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I run the Ultra-Flows in my 3" full exh system thats out to the back of the car and I use the X-pipe. I can say it is not as noisey as many cars out there when idleing or cruising. But when I nail it then it is alot louder. But I can listen to my radio when cruising along with no trouble. Ron Here is a clip of it idleing and driving off at light throttle. https://www.youtube.com/watch?v=bYIM2HLaOI4&feature=related
Last edited by 383man; 06/02/15 10:34 PM.
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