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Dynomax Super Turbo vs Ultraflow SS - big difference?

15K views 20 replies 10 participants last post by  DeanC24 
#1 ·
Both mufflers seem to be quite popular on this forum, but I have never heard either.
What is the difference, and what should I use in my system?
I hope for a mellow idle, don't mind to hear the exhaust when cruising or at highway, and hopefully a big growl at WOT.
Not a completely silent system, but something that don't wake all the neighbors in the morning.

The setup I'm planning is:
- 420HP 383
- shorty headers (more sound than stock manifolds??)
- no cats (more sound than with cats?)
- The Dynomax cat-back system 17375 with resonators (or without maybe?)
- Either the 20" Super Turbo or the Ultra Flow SS

After reading posts here, I think the Ultraflow + resonators gives a lot of sound even as a cat-back on original cars. Is that correct?

Hope you guys can give some advice here, before I buy everything and ship it all to Norway :)
 
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#2 ·
All Dynomax mufflers would be a good system for you car. With the 383, headers and no cats, anything is going to be fairly loud. Make sure and run an x pipe or some form of crossover pipe, these cars seem to respond well to them. As far as mufflers, I run stock manifolds, Magnaflow hi flo cats, 2 1/2" x pipe, Dynomax VT mufflers, and Dyno max over axle pipes and no resonators. My car at idle sounds mellow, great at WOT and no drone. In my case I have a very loud and well built 61 Impala for the hot rod sound, but I drive my 96 BBB daily, so I wanted the performance but no drone. Just go to YouTube and type in Caprice with Dynomax exhaust and see what you like. The loudest will be the Utra Flo, then the Turbo mufflers, and then VT which has a flapper Valve in it to base the sound off how much foot you put on her. Good luck and keep us posted
 
#15 ·
those aren't recommended for cars with aftermarket cams, unless you want your car to sound like the flapper on a diesel exhaust stack.
 
#4 ·
Ultraflo will be louder at any given rpm.It will be louder with no cats.Super turbo muffs can drone at cruising rpm so an X-pipe should help as well as tailpipes.The ultraflo will make more hp.
If noise is a concern then opt for the super turbo.I have had them on my 496 c.i. BB dodge for 20 years.I am tempted to try the ultraflo to see if their is a noticeable power gain.I may swap the super turbo's to my Impala SS when I do the full exhaust.
 
#5 ·
If you can get away with removing the catalytic converters, you might as well get the best exhaust possible to keep from strangling the 383 any more than necessary. Skip the shorties and install some Tri-Y or Quad long tube headers instead.
 
#9 ·
Do you think the difference between shorties and full-length headers is noticeable?

I'm worried about driveability, as other cars I've had with long tube headers have occasionally scraped, warping the flange and causing leaks in both reducer and flange gaskets.
The car is lowered with a 2" drop kit for 94-96 Impala SS.

If I were to order long tubes, it would be the Summit SUM-G9001.
The original plan was to go with the Flowtech 11108FLT, but now I'm in doubt..
 
#6 ·
I put Walker Dynomax Super Turbo's on my Lincoln and got approx. 10 years, 100,000 miles out of them. I am now on my second set. I also put them on my rarely driven, 79 trans Am. (Stock pipes on both cars).

IMO they sound great, little rumble at idle and accell, quiet at cruise.
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#7 ·
I can't speak for every muffler out there, but I've tried a few over the years.

I've consistently been impressed with the sound of dyno-max super-turbos. The longest body you can fit. Combine with a balance pipe. H-pipe gives a deeper mellower tone. X-pipe has a bit more bark and sharpness. Don't run anything without a balance pipe.

Sounds like a healthy V8, but it won't even raise an eyebrow at light throttle. This is how they should've left the factory. Even cops will leave you alone.

If you like the "poppy" sound, a chambered muffler will do the trick. But glasspacks with a balance-pipe are so SMOOOOOOTH.... Add resonators if it's still too loud for your tastes. You'll love it.

Super-turbos are NOT rust resistant. Be liberal with the cold-galv on your joints.
 
#8 ·
Thanks for all your input!
Now I'm confident the super turbo will be right for me.
I'll order the resonators as well, since international shipping is a large part of the cost.

Thanks for the info on H-pipe vs X-pipe, jkilo! The plan is to do it as simple as possible with 2.5" Dynomax pipes, but that leaves room for welding in an H-pipe later if I want it.

As for the headers, I was thinking of shorties because the car is lowered. I've had my share of scraping full-length headers with exhaust leaks.
...and the shorties are cheap!
But I'll look into it!

Sent fra min SM-G925F via Tapatalk
 
#10 ·
I think that for the Street Torque and driveability that the Shorties would be just right for you. Not much of a difference in my opinion on a vehicle with out a lot of HP.
 
#12 ·
I agree. Headers are a PITA. How much pain do you want?
 
#14 ·
this is for your '77 impala, correct?
if so, that will require a custom system, as those cars only came with single exhaust from the factory, and i think the crossmember design, only has a flat spot on the passenger side for the pipe.
You will need a custom bent exhaust.
this also opens up the header options, as you'd have more passenger side clearance than the 94-96 cars.

I would go with ulta flows myself.
 
#16 ·
Thanks, I'm aware of that.
I'm planning to cut a notch and reinforce the crossmember on the. I've seen it done on another 77-90 model, fo it should be fine.
 
#17 ·
If you're buying the complete 17375 system, it already comes with 304SS ultra flos. I would just use the ultra flos if that's the kit you are buying,
I don't know how much salt they put on the roads in Norway, but having lived in Quebec and Ontario most of my life and used both the ultra flos and super turbos on daily drivers, I can tell you the super turbos WILL NOT last more than 2-3 years. Although they do have a lifetime guarantee, they are made of aluminized steel and will rust through if used in an area that salts. Teneco has been VERY gracious to me and replaced them twice with just pics, but I've heard others have to mail in their mufflers to get a replacement.

Soundwise, they both sound good. The ultra flo is quiet enough for daily driver use if you keep the resonators and make sure the kit is installed properly. Distance from the floor makes a difference in droning.
 
#18 ·
Thanks!
I'm buying the kit in pieces, as that is actually cheaper (!) than buying the whole kit!
Then I get to choose mufflers and clamps myself. Going to try the summit/jegs band clamps, and if they don't seal I'll have it welded.

It's a summer driver, so salt won't be an issue. But yeah, we have a lot of road salt here in the winter. My red Tahoe is almost white after a week of driving to work.

Thanks again for the input.
Have you driven the Ultra flos with or without cats and headers?
I'm just afraid they'll be too loud with headers and no cats, even with resonators.
 
#19 ·
Ultra Flo SS

I have a pypes 2-1/2 system with x-pipe and no resonator. Also running Gen II Tri-Y and Random Tech hi-flow cats from CIA.
I installed the Ultra Flo SS mufflers, and the wife complained about how loud it was.
But I think it was more of the drone than the noise - because there isn't any resonators.
As a side note - if it was my car, I wold probably opt to put on the resonators and keep the mufflers.

So I just called DynoMax and will be returning the Ultra Flo SS for a set of the Super Turbo.
But I have a feeling that the lack of resonators are the culprit.
If the Super Turbo are still too "loud" for the wife, then I will put on the resonators and hopefully that will solve the problem.

Can anyone speak about the VT mufflers?
Those are the ones with the internal "flap", that keeps it quiet at idle and easy driving, then opens up with WOT. I am wondering if that is the direction I should take.
 
#20 ·
Can anyone speak about the VT mufflers?
Those are the ones with the internal "flap", that keeps it quiet at idle and easy driving, then opens up with WOT. I am wondering if that is the direction I should take.
Thanks for the info!

I believe Spaceman Spiff answered your question earlier (if you have an aftermarket cam):
those aren't recommended for cars with aftermarket cams, unless you want your car to sound like the flapper on a diesel exhaust stack.
I've read this before. People with aftermarket engines/cams sometimes have trouble with the flaps.
But on stock engines, I've heard nothing but good.
Supposed to be real loud when you get on it
 
#21 ·
All stock motor, except intake.
Thx!
 
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