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Will Glasspacks cause a loss in power?

This is a discussion on Will Glasspacks cause a loss in power? within the Exhaust forums, part of the Performance category; Guys, just like the title asks, will getting glasspacks on my 02' z71 decrease any power or torque. Thanksh...

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    Will Glasspacks cause a loss in power?


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    Guys, just like the title asks, will getting glasspacks on my 02' z71 decrease any power or torque. Thanksh

  2. #2
    has a manual! Whifflebat's Avatar
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    Yeah, as far as I know you could loose some low end torque if they don't provide enough backpressure.

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    shake & bake 91_bowtie's Avatar
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    Originally posted by Whifflebat
    Yeah, as far as I know
    That's not very far.
    08 TBSS
    91 HD 3/4 ton
    03 Z71 Tahoe

  4. #4
    has a manual! Whifflebat's Avatar
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    Originally posted by 91_bowtie


    That's not very far.

    Thats what you think.

  5. #5
    shake & bake 91_bowtie's Avatar
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    Originally posted by Whifflebat
    Thats what you think.
    08 TBSS
    91 HD 3/4 ton
    03 Z71 Tahoe

  6. #6
    has a manual! Whifflebat's Avatar
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    Only as far as you know.

  7. #7
    shake & bake 91_bowtie's Avatar
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    Originally posted by Whifflebat
    I've gotten even dumber since I've been in Iowa.
    Yes, we've noticed it too.
    08 TBSS
    91 HD 3/4 ton
    03 Z71 Tahoe

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    has a manual! Whifflebat's Avatar
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    Originally posted by 91_bowtie


    Yes, we've noticed it too.
    Noticed what?










  9. #9
    Proud Parent of a 5.7L V8 Z71Silverado98's Avatar
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    Yes, glasspacks are for sound not performance.
    98 Chevy Z71, PowerAid TBS, K&N FIPK, 2.25" Dual 50 series Flowmaster, SSBC Big Brake Kit, 305/70 ProComp Xterrains on 16x8 Am. racing Terons, 2" lift, CFM Tech Throttle Blade,B&M Elec. Shift Kit, Vette Servo, Trans-Go Shift Kit, Hooker Super Comp Headers, Descreened MAF.

  10. #10
    Ford... ha ha ha
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    I used glasspacks (Dynomax Bullets) on my truck and lost a WHOLE lot of low end power. They also sound like @ss, they pop and cackle everytime you let off throttle.
    1990 single cab
    5/7 Drop
    383 Stroker
    Eagle cast 383 crank
    5.7" Rods
    Keith Black Hypereutectic Flattop Pistons
    Holley Systemax Aluminum Heads (63cc chambers)
    Comp 292 (230/230@.050 109LSA) Cam
    Edelbrock Performer RPM Air Gap Intake Manifold
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    Taylor Thudnervolt 10.4mm wires
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    MSD 6-AL Ignition
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    Flowmaster 40's

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    Originally posted by Stroker_383
    I used glasspacks (Dynomax Bullets) on my truck and lost a WHOLE lot of low end power. They also sound like @ss, they pop and cackle everytime you let off throttle.

    LoL, thats what you get when you run a race muffler. The Bullets are NOT glasspacks
    1984 S10 Durango 2wd 355/4spd/10b
    Frame off..9.5" lift..35s
    1972 C10 RCLB 350/400/12b :fsc:
    Frame off soon...9.5" lift..whatever will fit under it

  12. #12
    Always Learning 01 GMC 4x4's Avatar
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    Glasspacks will cause you to loose power. They are not a performance muffler - All "bark" and no "bite". Several dyno test have shown that there are significantly better performance choices. The top 3 that I have seen are Hooker, Flowmaster and DynoMax.

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    Yea they will i noticed a big difference on my old old truck. 91 chevy silverado with single pipe no cat and glasspack when i changed to a flowmaster 40 series. Like everyone said they're for that redneck sound not performance.

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    Originally posted by 01 GMC 4x4
    Glasspacks will cause you to loose power. They are not a performance muffler - All "bark" and no "bite". Several dyno test have shown that there are significantly better performance choices. The top 3 that I have seen are Hooker, Flowmaster and DynoMax.

    Well I'm only 19, so who cares if it looses less than 10hp. Like you can't make it up somewhere else
    1984 S10 Durango 2wd 355/4spd/10b
    Frame off..9.5" lift..35s
    1972 C10 RCLB 350/400/12b :fsc:
    Frame off soon...9.5" lift..whatever will fit under it

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    Originally posted by Stevo
    Yea they will i noticed a big difference on my old old truck. 91 chevy silverado with single pipe no cat and glasspack when i changed to a flowmaster 40 series. Like everyone said they're for that redneck sound not performance.
    Just what is wrong with "That Redneck Sound"


    Damn Yankees
    1984 S10 Durango 2wd 355/4spd/10b
    Frame off..9.5" lift..35s
    1972 C10 RCLB 350/400/12b :fsc:
    Frame off soon...9.5" lift..whatever will fit under it

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    YeeeeeeeeeeeeeeeeeeeHAAAAAAAAAAAA!!!!!
    Andrew
    1994 Fullsize Blazer 5.7L 4x4
    On the quest for better gas milage!

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    [QUOTE]Originally posted by BadAss_2002
    [B]

    Just what is wrong with "That Redneck Sound"


    Well if u like that sound go for it lol. I used to like it but now i kinda like the muscle car sound that flowmaster kind of gives u

  18. #18
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    [QUOTE]Originally posted by Stevo
    [B]
    Originally posted by BadAss_2002


    Just what is wrong with "That Redneck Sound"


    Well if u like that sound go for it lol. I used to like it but now i kinda like the muscle car sound that flowmaster kind of gives u

    LoL, Well I'm considering dual Dynomax Bullets or just dual 2" straight pipes with 3.5" turn downs infront of the wheels. I think it'll be loud enough then;-). The flow sound is getting old. Its sad when they're louder at idle than at WOT
    1984 S10 Durango 2wd 355/4spd/10b
    Frame off..9.5" lift..35s
    1972 C10 RCLB 350/400/12b :fsc:
    Frame off soon...9.5" lift..whatever will fit under it

  19. #19
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    As far as i know the 4.8 and 5.3 engines for one put out more air flow then my mustang and the compression is higher, so i dont see why having a straight flow muffler would cause these trucks to lose any HP. Im sure itll lose TORQUE at a lower rpm but at a higher rpm im sure your at a gain.
    And how many of your trucks spend most of their time in the 2k-2.5k rpm range. Its all about high end power baby

 

 

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