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Dynomax Ultra Flo?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Shawn, Mar 7, 2001.

  1. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Anyone have the Dynomax Ultra Flo muffler? I'm thinking about getting a set for the Blazer. I've heard a few had some good things to say but I was wanting to get more opinions before I order them. These would be the welded 6" round mufflers with 3" in/out (part # 17223) and I'd be running 2 of them with an H pipe. According to Dynomax specs, they flow over 2200 CFM each which is more than plenty for the 496 big block I think. According to the info page below, they out perform the major brands including Flowmaster.

    Info and specs:
    http://www.dynomax.com/documents/ultrafloweld_specs.pdf

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     
  2. muddin4fun

    muddin4fun 3/4 ton status

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    Re: Dynomax Ultraflos?

    I've got flowmasters and I like them a lot. I've never heard any bad raps about flowmasters.

    [​IMG] Keep your feet dry [​IMG]
    <A target="_blank" HREF=http://muddin4fun.coloradok5.com>http://muddin4fun.coloradok5.com</A>
     
  3. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Re: Dynomax Ultraflos?

    No offense against Flowmaster owners but these supposely flow better:
    1133cfm vs 435cfm on a 2.5" muffler

    I was searching the LS1.com forum and a few suggested these instead of the Flowmasters.

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     
  4. Burt4x4

    Burt4x4 3/4 ton status

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    Re: Dynomax Ultraflos?

    Ya but on the flip side don't forget if you have TOO much flow and not enough back pressure doesn't that decrease your Torque??? Seams to me I read that somewere???
    Like a 3"dule exahust doesn't produce as much torque ans a 2 1/2" dule set up! Yes/No ?? am I smokeing to much ganga again?? It's possiable I love that stuff!![​IMG]

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  5. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Re: Dynomax Ultraflos?

    I'm not too worried loosing a little torque, I got plenty. [​IMG] I'd rather have a little more HP in the upper end if anything. And according to Dynomax, I should be running a dual 3.5" system for the 496 but I think 3" is plenty.

    From Dynomax site:
    [​IMG]

    I called Dynomax and they said a dual 3" system with a balance tube and those mufflers would be fine for my application.

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     
  6. muddin4fun

    muddin4fun 3/4 ton status

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    Re: Dynomax Ultraflos?

    that's what I understand also. More is not always better [​IMG]

    [​IMG] Keep your feet dry [​IMG]
    <A target="_blank" HREF=http://muddin4fun.coloradok5.com>http://muddin4fun.coloradok5.com</A>
     
  7. Burt4x4

    Burt4x4 3/4 ton status

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    Re: Dynomax Ultraflos?

    OK thats cool then. I guess having a BBC changes the my SBC train of thought. According to that chart a 3" on a SBC is NOT what they recomend but on a stroked 454 well........MAN that is gonna be some serious power Bro!! Hey by theway how do you like your drive shafts?? I noticed the PotentRodent on the DrivelineMans site!!??
    Late

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
    <A target="_blank" HREF=http://www.burt4x4.coloradok5.com>http://www.burt4x4.coloradok5.com</A>
     
  8. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Re: Dynomax Ultraflos?

    IMO, I think a dual 3" exhaust on a 500ci engine is the same thing as a dual 2.5" on a 350ci engine. I don't think I'll be loosing any torque with a dual 3" system. My 496 engine is pushing 550hp and 620lbs of torque.
    http://www.off-road.com/chevy
     
  9. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Re: Dynomax Ultraflos?

    Burt-
    Well, I hope it makes that much power. I take the Dyno2000 figures with a grain of salt.

    I love High Angle's shafts. Really smoothed things out. Those 1350 CV shafts should be able to handle the power.

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     
  10. Burt4x4

    Burt4x4 3/4 ton status

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    Re: Dynomax Ultraflos?

    WOW damn thoes # are high. You sure your rig isn't gonna twist into a pretzel[​IMG]!! Man now thats power!!

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  11. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Re: Dynomax Ultraflos?

    Maybe I should install some anti-pretzel braces on it! [​IMG][​IMG][​IMG][​IMG][​IMG]

    After the engine is broken in, I'll do a chassis dyno and get the real RWHP which the figures should be lower since it has to go through all the one ton crap. Wish I could of done of flywheel dyno before I installed it. Still waiting for Holley to send the new Commander computer and larger injectors. Should be here anyday (I hope).

    Shawn
    87 K5
    few mods[​IMG]
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  12. Triaged

    Triaged 1/2 ton status

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    I have a Dynomax in my s-10 (much smaller than your engine). The main difference between the 2 are that the Dynamax's are glasspacks (or maby stainless) and the Folwmaster are canceling chambers. The Dynamax flow better and are quieter (I have a friend with dual 3" 3-chamber Folwmaster's and I have herd him from almost 2 mi away!). I think that the Flowmaster's make more top end hp because to the ex flow they act more like a open ex. The Dynamax make more torque because they act like a strate tube going all the way back. Flow #'s ain't everything. Either way you can't go wrong. I think that most people go with the Flowmaster just because they like the way they sound. Personaly I would get the Dynomax because they are quieter.

    '71 Blazer CST with alot of rust
     

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