Dynomax mufflers

Hi everyone,

I am currently running a 2 1/2" TTI Xpipe setup on a 550hp setup with superturbo mufflers. Are there any benefits of running the Ultra flows in 2 1/2". The car is for street only. Ultra flow makes 2 lengths. One is exactly the same length as my super turbo which is 20"s. The other is 14"s. Does it matter which length I choose?

Thanks

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

RapidRobert,

I was just curious if I switched to the Ultra Flo's would I be gaining any hp over the super turbo's? I figured with using 2 1/2" exhaust with that much hp, the straight through design of the Ultra Flo's should help with more flow? If I am going to gain a couple of hp then I would just stay with the super turbo's. If we are talking 10hp then I would switch to the Ultra Flo's.

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

LOL, you got to love the electric cut outs!

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.

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

Thanks guys,

Dynomax ultraflo at 1133 and Dynomax super turbo at 410 cfm looks like a huge difference. It might be worth the change.

These are DECIBEL ratings?...........(joking)

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.

Anyone know what the Hooker max flow mufflers are rated at ??

Seems like you are in a perfect position to do some track testing of each and reporting back

I think I may have to buy a set and try them out. I would think they will make more power than the Super Turbos. Thanks everyone.

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!

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.

I went ahead and ordered the Ultra flo's today. I am thinking with my hp range the Super turbos have to be restricting it.

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.

Many years back (high school) when I heard the name "Turbo Mufflers", I thought they must have a Turbine Wheel inside that would spin to reduce noise, yet be less restrictive. Never tried cutting one open.

Of course, the name instead referred to mufflers used on Turbocharged Chevrolet Corvairs, designed to be less restrictive.

Also, what about "Muffler Bearings"?

That is what I am looking for more power! That is a nice muffler bearing. Lol

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

That sounds amazing.

My previous car 71 Duster 340 race car I went from open exhaust 11 inch extentions to 3 inch tti x pipe 3 inch dynamax bullets and went faster. It was loud but not as bad as open then went to 3 inch ultraflow ran the same but was so quiet at idle I couldn't here it at the start line. Went back to the bullets. I ran 11.30s stock stroke 340. Fun car to drive its been gone 3 weeks and I miss it. My neighbors are happy though its amazing how well you can run with a full exhaust.

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

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.

Thanks. Ron

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.

The Cherry Bomb Vortex apparently flow just a few cfm below what a straight 3" pipe will. They're probably what I'm going to use on my '67 Coronet when I put a 3" system on it

Here's the internal design of the Cherry Bomb Vortex:

" One is exactly the same length as my super turbo which is 20"s. The other is 14"s. Does it matter which length I choose?"

Yes, the shorter and/or high flow will be louder. Loud can give your subconscious a headache on longer drives. Convertibles especially.

Here is how the DynoMax sound on my roadrunner. Its a prety much stock 383 with TTI headers.

https://youtu.be/IrvhuBVRqQk

Are these figures ALL for 2 1/2?? [/quote]

No - 2.5" & 3" combined I guarantee you. This list should have been separated by the different size mufflers. [/quote]

lol, went and looked at some part numbers, some of them are 4"-5" - im not too sure some of the bigger ones are accurate either 2200cfm seems a bit more than what a bare 4" pipe would flow?

Hi Guys,

I ordered the ultra flow mufflers in 2 1/2". I am thinking I may have made a mistake and should switch my complete exhaust system to 3". My TTI collectors are 3" then they reduce down to 2 1/2" to my TTI Xpipe. I know the motor will make 550-600hp on my current build. This is a 500 cube used for the street. I believe the FAST class is running 2 1/2". What about changing the x pipe to 3" and also the ultra flows then reduce them to 2 1/2 for the tail pipes?

A lot of work for a street car.Sure it may make a few more ponies but is it worth the expense?You will already be up a few ponies from switching to the ultra flows.Drive it as is first and see how you like it.

3"

I am sure by just switching to the ultra flow's from the super turbo's will make a difference.