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Flowmasters vs Glass Packs

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 77K5Blazer, Mar 16, 2001.

  1. 77K5Blazer

    77K5Blazer 1/2 ton status

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    Alright, I am looking for new mufflers for my new K5. I want something louder than the "midas" that are on there, but I don't want it obnoxious! So, do I get Flowmaster Series 40's, Series 50's, or 20" Thrush glasspacks? Anybody out there with any of these mufflers?

    1977 Blazer w/ 350 GM crate motor
    44 front/ 12-bolt rear, gear driven NP205
    31x10.50r15 BFG All-terrain- Larger on the way!
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I have the 50 series Flow-masters, 2 1/2" diameter true duals. It has a nice throaty rumble to it but is not too obnoxious, unless you lean on the skinny pedal. Glass packs suck, IMHO they can make a nice truck sound like a complete POS! I really don't know why anyone would ever want their truck to sound so bad!

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  3. Derf00

    Derf00 1/2 ton status

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  4. MudFrog

    MudFrog 1/2 ton status

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    I gotta love my MagnaFlow!

    89 K5 Silverado
    <A target="_blank" HREF=http://mudfrog.coloradok5.com>http://mudfrog.coloradok5.com</A>
     
  5. muddin4fun

    muddin4fun 3/4 ton status

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    I'm runnin the same as rusty. I love them! They rumble really well...

    [​IMG] Keep your feet dry [​IMG]
    <A target="_blank" HREF=http://muddin4fun.coloradok5.com>http://muddin4fun.coloradok5.com</A>
     
  6. Confederate9

    Confederate9 1/2 ton status

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    what i heard flowmasters have 1 year guarntee.
    i run magnaflow. its loud, not too loud. a nice low rumble on idle, pretty loud on the accelaration then let off the gas and its not loud.
    also not loud in the cab.
    glaspacks seem more for sports cars, not trucks
    my .02

    <A target="_blank" HREF=http://confederate9.coloradok5.com/>http://confederate9.coloradok5.com/</A>
    <font color=red>K5: Because size DOES matter</font color=red>
    [​IMG]
     
  7. reddog64

    reddog64 1/2 ton status

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    I had glasspacks... Went to Flowmasters dual 2.5 w/ headers... AWSOME difference... At least 18-22 HP Gain... No Joke...
    Spend the extra 30 bucks per muffler and get the flowmasters...
    Glasspacks are a waste of money and they rob power from your motor...
    I like the rumble they make at idle...
    And with headers you can hear the individual cylindars firing when it idles at 500 rpm.....
    AWSOME...

    Um... yes officer I know it's too big...
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Flow-master might offer a 1 year guarantee, but Midas will sell and install them with a lifetime gaurantee...[​IMG]

    Regardless, mine have been on the truck for 4 years and they still look reasonably new. Have you ever compared one side by side to another muffler? The Flow-masters are built with very thick steel, I expect at least another 5 years out of them easy! I've had turbo mufflers (car-speak for cheap crap) and gotten a whole 6 months out of them, good thing too because they sound like crap.
    Exhaust note is subjective but in my opinion Flow-master is the muffler to beat, for sound quality, for performance and for longevity!

    Just my extremely biased opinion [​IMG]

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  9. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    i have 2.5 flowmasters on mine not sure what series mine are but i love the way they sound. i get lots of complaments on the way it sounds so i am asuming that they sound good to others as well

    s.smith 77blazer lookin 4 mud [​IMG]
     
  10. Thunder

    Thunder 3/4 ton status

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    I'm running Flowmaster 70 series on mine and like them a lot. Great power increase. And they are quiet at idle and highway speeds. But it really sounds great when you mash the throttle. I am always getting compliments on how good and healthy my K5 sounds. Even my wife, who hates loud obnoxious trucks thinks it sounds great. Of course the Edelbrok Tubular Exaust System I just installed may have helped a little too.
     
  11. BMR

    BMR 1/2 ton status

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    Glass packs are for people that are to lazy or to cheap to get anything good. You can go to any autoparts store and pick them up, there a dime a dozen. Flowmasters are a good quality muffler you get what you pay for. I got Flowmasters American Thunder 2 chamber mufflers on my truck and it makes my 305 sound mean. Good deep rumble, not that ratty obnoxious nosie that glasspacks produce. Don't go half-a$$ get quility.
     
  12. BlazerGuy

    BlazerGuy 3/4 ton status

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    I like the sound of my glasspacks but it gets annoying if your on the highway for a long period of time(probably wouldn't be that bad if I had some carpet), but hey it's my job to have a truck with loud ass exhaust [​IMG][​IMG]

    Murphy's Laws on Life :
    "Opportunity always knocks at the least opportune time." [​IMG]
     
  13. 90K5

    90K5 1/2 ton status

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    I love the way my Flows sound, hate the way glasspacks sound. Its more of a junky cheap sound on them, and makes the truck seem more like a POS. BTW, i know a guy who put glasspacks on a Bimmer!!!!!! It sounds allright on it though, not like a V8 at all, actually almost sounds like rice...

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  14. kumma

    kumma 1/2 ton status

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    I had to replace the muffler on my truck, the PO put on a 3" exhaust so i went with Flowmaster 40 series, it sounded awesome at idle but it roared on the expressway so i replaced it with a 70 series. It sound good at idle as well as being quiet on the road. Never even thought of glasspacks, i had to many cheap mufflers on other cars.

    Craig

    [​IMG]
     
  15. wayne

    wayne 3/4 ton status

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    Go with Flowmasters.

    <A target="_blank" HREF=http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html>http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html</A>
    <font color=blue>Happy Trails[​IMG]</font color=blue>
    <font color=blue>Wayne</font color=blue>
     
  16. 77K5Blazer

    77K5Blazer 1/2 ton status

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    Now... I have concluded that Flowmasters are it. But... which series? I want it to be deep and throaty at idle, and have good tone. I want it to BARK when I step on it, but be quiet at highway speeds when cruising. I am thinking that the 50's would be the best, what do YOU think?

    1977 Blazer w/ 350 GM crate motor
    44 front/ 12-bolt rear, gear driven NP205
    31x10.50r15 BFG All-terrain- Larger on the way!
     
  17. rock.monkey

    rock.monkey 1/2 ton status

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    I have dual glasspacks,2 1/2" pipe, on my Jimmy. It was real loud untill i put in a "H" pipe. Now it sounds smooth and mean. I get LOTS of complements on how GOOD my truck sounds.

    Bill Innes
    88' Jimmy

    Built for <font color=blue>Function</font color=blue> <font color=red>NOT</font color=red> <font color=blue>Fashion</font color=blue><P ID="edit"><FONT SIZE=-1>Edited by rock.monkey on 03/16/01 09:57 PM (server time).</FONT></P>
     
  18. Blazer79

    Blazer79 1/2 ton status

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    Listen to them for yourself on my website. They are loud only if you want them to be.

    <font color=blue>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A>
    </font color=blue>[​IMG]
     
  19. talison79

    talison79 1/2 ton status

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    I recently did some research on mufflers and looked into the usual suspects and went with the Hooker maximum flow, it has a great sound, great flow and doesn't break your bank. That is one heavy duty muffler it weighs a ton, very thick metal great quality. I went with the 3" in and out and its 3 inches all the way through. Check out the link below for a flow comparison on some mufflers, it will give you an idea of what type to look for. Interestingly enough baffled muffles like the Flow Master don't really flow that well. Not trying to ruffle any feathers. Hope this helps.

    http://www.autospeed.com/S_feature/A_0383/P_1/article.html
    http:// www.atlantabuick.com/Mufflers.htm
    This link is to a comparison on sound.
    http:// members.tripod.com/~racetruck/muffler.html
    Talison79

    <P ID="edit"><FONT SIZE=-1>Edited by talison79 on 03/17/01 00:07 AM (server time).</FONT></P>
     
  20. grtwhite

    grtwhite 1/2 ton status

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    Glad to hear that your gonna go with the Flowmaster. I've got a 3" 50 series muffler. No complaints. It has a nice rumble at idle, & when you apply the skinny pedal it speaks. Nice & quite at highway speeds. I'm real happy with it. Hope this helps - Jay
     

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