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Exhaust opinions

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CaptCrunch, Mar 23, 2001.

  1. CaptCrunch

    CaptCrunch 1/2 ton status

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    Ok guys... seeking a few opinions here... First off I have a 87 Blazer... TBI 5.7... da da da...
    Anyone running the flowtech AFTERBURNER headers? what do you think?

    Second... cats or no cats? No emissions here...

    Third if I go cats will a flowmaster 2 chamber after the cat make it louder then if I just ran the cat and then straight pipe?

    And last of all... like the flowmaster 2 chamber 40 series... anything out there that isn't 60 bucks a muff and give a nice deep loud rumble?

    Thanks guys, sorry for the mini birage(sp?) of questions... just want some other opinions besides my own drag race mentality LOL

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  2. muddin4fun

    muddin4fun 3/4 ton status

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    I've go flow master 50-series with headers. I don't know how many chambers it has. They sound nice. They are just loud enough so that I can hear what the motor is doing while driving normally, but when it's on the ground they sure do open up! The cat (in my opinion) restricts more noise than the muffler. In order to pass inspection if you are in a county that just does a visual inspection, you'll need something up there that makes it look like you have a cat. You can just run the cat through and reinstall it. A lot of people have said to run an exhaust pipe through it cause the weird shape of a hollowed out cat disrupts the airflow. The flowmasters are expensive, but they last a lot longer. They use baffels inside instead of fiberglass that can wear out. I've got a 60 series on the camaro and the 50-series on the blazer and am happy with both. My blazer has duals so it's a little bit quieter even though that particular series is supposed to be louder. When the blazer is outside idleing, pictures inside the house rattle on the wall, but it's not loud. It's more of a low rumble. Hope this helps!

    [​IMG]


    <A target="_blank" HREF=http://muddin4fun.coloradok5.com>http://muddin4fun.coloradok5.com</A>
     
  3. BlazerGuy

    BlazerGuy 3/4 ton status

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    I dont know about others but when I was replacing my exhaust, I cut off the mufflers and drove it with just the cat and there wasn't any difference in sound with or without the cat. The cat doesn't muffle the sound at all so it will sound just like open headers.

    Murphy's Laws on Life :
    "It is a mistake to allow any mechanical object to realize you are in a hurry."
     
  4. CaptCrunch

    CaptCrunch 1/2 ton status

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    Well absolutly nothing here... no visual... no sniffer...nadda. Only good thing Jesse Ventura has done since he got in office, but he has pretty much guarenteed himself no re-election lately. But I want it LOUD! I like the sound of thrush glasspacks because they aren't so tin can sounding, but really want the deeper rumble... I used to to have the 40 series as well... they are a 3 chamber and sound great...Just maybe a little more at cruise. I have the stock cat on now w/ a blown out, leaking muff [​IMG] on the crappy single pipe Gibson system... was on when the truck when I got it... Not loud enough and surely not open header sounding... Usually I'm not cheap, but my 496 Stroker motor needs to find a GTO to go into... and soon.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  5. CaptCrunch

    CaptCrunch 1/2 ton status

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    up to the top

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  6. Shawn

    Shawn 1/2 ton status Premium Member Author

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    The Afterburners look like they would work ok but I'd like to see them with a ceramic coating. Paint just flakes off after 1 week.

    I went with the 3" Dynomax Ultraflows which are suppose to have a nice sound to them and they outflow the Flowmasters.
    [​IMG]
    Check out the links below for a flow comparison on some mufflers. None of the tests showed the Ultraflow though (model 172XX). The Dynomax mufflers used in the test below is the normal Dynomax Super Turbo muffler and not the Ultraflow.

    http:// www.atlantabuick.com/Mufflers.htm
    This link is to a comparison on sound.
    http:// members.tripod.com/~racetruck/muffler.html

    [​IMG]

    [​IMG]

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

    Shawn 1/2 ton status Premium Member Author

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    Sorry, I just saw you wanted something less than $60 each. Thats the cost of the Ultraflows and I'm not sure of anything else out there thats cheaper besides the cheap turbo mufflers and glass packs.

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

    CaptCrunch 1/2 ton status

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    Thanks for the links Shawn.... I kinda decided the heck with it... like you said time to bust out some plastic [​IMG]. Heck all my cards are at zero balance thus far so might as well find a small debt LOL. also like mudd'n said they will last a heck of a lot longer... Plus I really want the deep throaty idle that turns heads... debating between 40 and 50 series flowmasters w/ no cats and also looking at the dynomax Ultra-flo's... although sound is more important to me here then performance. Even listened to them on dynomaxes site... might be a bit too quiet at idle... would love a roaring idle and a tough nicer inside the truck if I'm cruising... So Shawn have you fired up that bad boy yet? I'm sure it will thunder no matter what muffs you got [​IMG]

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  9. Shawn

    Shawn 1/2 ton status Premium Member Author

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    I talked to a friend of mine and he said the Ultraflows round series are much louder than the ovals. I even called Dynomax and they confirmed that. I want mine to be a little quiet so I got the ovals but if you want loud, get the round short mufflers. Basically, the smaller the muffler, the louder it is. Haven't got mine going yet. I had some header issues and I should be getting real squashes Thorleys any day. I'm not sure when I'll get that POS done. Also been doing several mods to my GTP so it's been tough finding the time.

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     
  10. Blazer79

    Blazer79 1/2 ton status

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    You can hear my Flowtech afterburners+HPipe+Flowmaster 40s on my website.

    <font color=blue>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A>
    </font color=blue>[​IMG]
     
  11. muddin4fun

    muddin4fun 3/4 ton status

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    It sounds like mine!!

    [​IMG]


    <A target="_blank" HREF=http://muddin4fun.coloradok5.com>http://muddin4fun.coloradok5.com</A>
     
  12. CaptCrunch

    CaptCrunch 1/2 ton status

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    Cool... I'll look into those also... Sounds like a d@mn drag car motor... one problem after another.... But I guess if it was easy as 1-2-3 it wouldn't quite be so enjoyable in the end. So you picked up Squash's headers... from the pics I've seen they look sweet. A shame what happened to his truck... but I managed to withstrain myself to only purchase his ORD steering brace... LOL. Thanks again for the great info Shawn

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  13. CaptCrunch

    CaptCrunch 1/2 ton status

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    Hey cool!!! Kinda hard to judge, but sounds pretty sweet.... Still tossing around I deas... just think it is funny that the 50 series is more money then the 40 series... How did the afterburners fit and what's plug clearance like??? thanks..

    p.s. Nice rig by the way... good to see that it isn't little econo turds over there [​IMG]

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  14. Blazer79

    Blazer79 1/2 ton status

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    Thanks. The Afterburners went in pretty easily. Drivers side was easy coming in from below, pass side easy from the top. Didn't hit anything, perfect fit.

    I changed plugs once after the headers. All were pretty easy, except for the #8, which it would have been easy with a u-joint socket, but mine was broken. I think it was #6 the one I needed a medium extension. I only had a small one and a large one. I ended up holding the large one with a vise-grip to turn the spark plug.

    <font color=blue>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A>
    </font color=blue>[​IMG]
     
  15. Blazer79

    Blazer79 1/2 ton status

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    So I guess yours sounds very cool![​IMG] hehe

    <font color=blue>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A>
    </font color=blue>[​IMG]
     
  16. BlueKnight

    BlueKnight 1/2 ton status

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    Well on my 79 im running a custom dual exhaust with flowmaster 40's on the running 2 1/2" out the side behind the rear wheel with 3" exhaust tips. The sound is beefy and deep and what I like is unique. The exhaust was installed 5 years ago and still going strong. I highly recommend flowmasters.

    <font color=purple>79' K-5 396cid 600hp, TH350, NP203</font color=purple>
    <A target="_blank" HREF=http://blueknight.coloradok5.com>http://blueknight.coloradok5.com</A>
     

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