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: 4,741 Holland MI Ottawa
2boltmain
master
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master
Joined: Jul 2003
Posts: 4,741
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: 5,442 Indiana
YO7_A66
master
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master
Joined: Jan 2003
Posts: 5,442
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: 9,963 Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,963
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..603 156 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: 13,319 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,319
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, 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: 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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Re: Dynomax mufflers
[Re: 383man]
#1840112
06/02/15 10:52 PM
06/02/15 10:52 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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Re: Dynomax mufflers
[Re: Beep Beep]
#1840966
06/03/15 11:04 PM
06/03/15 11:04 PM
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Joined: Apr 2003
Posts: 1,800 South Lyon MI
sleddinfool
top fuel
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top fuel
Joined: Apr 2003
Posts: 1,800
South Lyon MI
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The car I am currently building is at the fab shop getting a 3" header to bumper system with pypes racepro mufflers. When I took them out of the box I could see right trhough them-- Hope they aren't too loud. Kevin
71 gtx.....
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Re: Dynomax mufflers
[Re: sleddinfool]
#1841009
06/03/15 11:48 PM
06/03/15 11:48 PM
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Joined: Jan 2003
Posts: 8,390 Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,390
Highland, MI.
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They will be very loud - trust me. Any 3" straight-through muffler will be a lot louder than a 2.5" muffler.
The flow specs listed look like they came right from Dynomax - or they were tested the same way using 20.3" H2O as the gauge. To the OP, if you have 550 HP & were running dual 2.5" Super Turbos, they will provide approx. 380 loss-free horsepower, so yes they were restrictive to an extent. The stainless 2.5" x 20" bodied Ultra Flows will flow 1075 sCFM, & are rated at 978 loss-free HP in a dual system. I also believe they will not be too loud - they may not be much louder than the Super Turbos until you are all the way in the throttle. These would be my first choice for a stock-looking muffler setup if I wanted an oval muffler & maximum flow. Most of the guys in the Pure Stock drags use Ultra Flows. If you have room for resonators in the system (maybe back in the tailpipes?), you could add those also for extra noise control if you need it. I can build you some in any length if you need something compact & effective.
Another muffler I really like the looks of (internally), are the Cherry Bomb Vortex mufflers, except they are built like boxes. Internally however, they have a really close design to some I designed a few years ago & I've heard a few sound clips with these mufflers installed & I like the way they sound. Plus, they will flow very well although I've never seen flow specs on these under the same type of baseline testing we did at Dynomax.
No Man With A Good Car Needs To Be Justified
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Re: Dynomax mufflers
[Re: 62maxwgn]
#1841217
06/04/15 09:25 AM
06/04/15 09:25 AM
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Joined: Feb 2014
Posts: 234 Brisvegas, Australia
Alchemi
enthusiast
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enthusiast
Joined: Feb 2014
Posts: 234
Brisvegas, Australia
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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 Are these figures ALL for 2 1/2??
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Re: Dynomax mufflers
[Re: Alchemi]
#1841359
06/04/15 01:05 PM
06/04/15 01:05 PM
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Joined: Jan 2003
Posts: 8,390 Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,390
Highland, MI.
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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 Are these figures ALL for 2 1/2?? No - 2.5" & 3" combined I guarantee you. This list should have been separated by the different size mufflers.
No Man With A Good Car Needs To Be Justified
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