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Thread: performance Muffler flow and noise data

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    Default performance Muffler flow and noise data

    The Mufflers
    MAKE MODEL Part No. COST
    SUMMIT Turbo 630125 $14.75
    THRUSH Magnum Glasspack 24214 $16.50
    THRUSH Boss Turbo 17718 $23.95
    HOOKER Competition 21006 $25.95
    DYNOMAX Super Turbo 17733 $28.50
    DYNOMAX Race Magnum 24215 $31.95
    HOOKER Super Competition 21106 $35.95
    SUMMIT Fully Welded 630325 $38.69
    FLOWTECH Afterburner 50322 $39.95

    MUFFLER FLOW TEST

    MUFFLER Flow at 28-in H20
    DynoMax Race Magnum 528.64 cfm
    Thrush Magnum Glasspack 507.40 cfm
    Summit Fully Welded 343.38 cfm
    Flowtech Afterburner 342.20 cfm
    DynoMax Super Turbo 333.94 cfm
    Hooker Competition 232.46 cfm
    Hooker Super Competition 320.96 cfm
    Summit Turbo 331.16 cfm
    Thrush Boss Turbo 297.36 cfm

    MUFFLER Idle dB WOT dB
    DynoMax Super Turbo 89 123
    DynoMax Race Magnum 94 133
    Flowtech Afterburner 92 124
    Hooker Competion 92 122
    Hooker Super Competion 90 125
    Summit Turbo 89 124
    Summit Fully Welded 92 125
    Thrush Boss Turbo 90 123
    Thrush Magnum Glasspack 92 128

    DYNO TEST
    All mufflers were dyno-tested on a 355-cube SBC with 10.0:1 compression, Air Flow Research 190 aluminum heads, a CompCams 292 hyd. a Victor Jr. intake, a Holley 750-cfm double-pumper, and 1 5/8 Headman headers.


    MUFFLER HP TORQUE 2,500-6,000rpmAverage
    Hooker Competition 397.4 381.1 286.8hp/351.9 lb-ft
    Thrush Boss Turbo 407.1 384.9 292.1 hp/357.5 lb-ft
    DynoMax Race Magnum 409.5 394.3 298.8 hp/366.9 lb-ft
    Flowtech Afterburner 409.7 391.2 294.8 hp/361.7 lb-ft
    Thrush Glasspack 409.5 389.8 297.7 hp/365.3 lb-ft
    Summit Turbo 411.5 386.3 291.5 hp/357.4 lb-ft
    DynoMax Super Turbo 412.7 387.2 292.6 hp/358.6 lb-ft
    Hooker Super Comp 413.8 387.2 292.8 hp/359.0 lb-ft
    Summit Fully Welded 415.4 390.7 295.6 hp/362.4 lb-ft



    A few more numbers.

    All tests via an independent lab
    All tests @ 15 wc

    2 Straight Pipe 283 CFM
    2 Straight Pipe 365 CFM
    2 Straight Pipe 521 CFM

    2 Typical Bent tailpipe 268 CFM
    2 Typical Bent Tailpipe 417 CFM

    2 Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM
    2 Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM
    Same as above set for reverse flow 141 CFM
    2 Cherry Bomb 239 CFM
    2 Cherry Bomb 294 CFM

    2 Inlet/Outlet Dynomax Super Turbo 278 CFM
    2 Inlet/Outlet Ultraflow Bullet 512 CFM
    2 Inlet/Outlet Gibson Superflow 267 CFM
    2 Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM
    2 Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM
    2 Inlet/Outlet Thrush CVX 260 CFM
    2 Inlet/Outlet Maremount Cherry Bomb 298 CFM
    2 Inlet/Outlet Hooker Aero Chamber 324 CFM
    2 Inlet/Outlet Hooker Max Flow 521 CFM
    2 Inlet/Outlet Borla Turbo 373 CFM
    2 1/2" Inlet/Outlet Magnaflow 284 CFM


    Standard OEM 2 Inlet/Outlet 138-152 CFM
    Standard OEM 2 Inlet/Outlet 161-197 CFM

    __________________________________________________ ______________
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    + Edelbrock 5501 492 scfm 2.25"
    $ Flowmaster 42440 483 scfm 2.25"
    Race Magnum Welded 17216 711 scfm 2.25"

    + Edelbrock 5511 579 scfm 2.50"
    $ Flowmaster 42540 352 scfm 2.50"
    Ultra-Flo SS 17263 1133 scfm 2.50"
    Race Magnum Welded 17218 1000 scfm 2.50"
    # Borla 40600 836 scfm 2.50"

    + Edelbrock 5505 708 scfm 3.00"
    $ Flowmaster 43040 392 scfm 3.00"
    Ultra-Flo SS 17296 2200 scfm 3.00"
    Race Magnum Welded 17220 2200 scfm 3.00"
    # Borla 40450 1400 scfm 3.00"
    # Borla 40575 1100 scfm 3.00"

    @ Edelbrock 5535 562 scfm 3.50"
    $ Flowmaster 435409 576 scfm 3.50"
    Ultra-Flo SS 17268 2200 scfm 3.50"
    Race Magnum Welded 17224 2200 scfm 3.50"
    # Borla 40615 854 scfm 3.50"

    @ Edelbrock 5537 1400 scfm 4.00"
    * Flowmaster 54040-10 634 scfm 4.00"
    Race Magnum Welded 17225 2600 scfm 4.00"
    # Borla 40741 1450 scfm 4.00"

    + Edelbrock General Application Series
    @ Edelbrock Victor Series Race
    $ Flowmaster 40 Series ( 2 Chamber)
    * Flowmaster Delta Force Race Series
    # Borla XR-1 Racing Series (Round or Oval)

    85 4 door 351 CV - 160KMs stock and with issues... 4BBL swap and other goodies in the spring...next spring

    06 Mazda 3 hatch 2.3L 5AT (current daily)

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    85 4 door 351 CV - 160KMs stock and with issues... 4BBL swap and other goodies in the spring...next spring

    06 Mazda 3 hatch 2.3L 5AT (current daily)

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    RESTORE ... MAINTAIN ... CUSTOMIZE rick99601's Avatar
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    good info
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    Mazda5: the Anti-Van! 1987cp's Avatar
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    Sticky this!!! And add to it!!!

    Now maybe we can be rid of all those lame "which muffler should I buy because I want my stock single exhaust to be louder" threads.
    2012 Mazda5 Touring | Click below to buy my cool '81 LTD:

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    Something that might be useful is getting a list of what mufflers are "clones" of ones on this list.

    For instance, Thrush Welded mufflers are just Flowmaster 2-chambers with very minor tweeks.

    85 4 door 351 CV - 160KMs stock and with issues... 4BBL swap and other goodies in the spring...next spring

    06 Mazda 3 hatch 2.3L 5AT (current daily)

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    Mazda5: the Anti-Van! 1987cp's Avatar
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    Not a bad thought. I tend to forget the confusion a car-enthusiast newbie has when seeing all the different brands and model names, with no clue how the interior is designed.

    I noticed the OP doesn't have info on Corsa mufflers. Not that most GMNers can afford them, but their broadband sound cancellation seems like a really nifty design. And of course brands like Spintech are very popular with racing types and employ yet another variation on the weld-baffles-in-a-clever-arrangement core.

    I'd also suggest looking for info on Walker QuetFlows for those who might want a more stockish sound level (not that we know any of those types ... ).
    2012 Mazda5 Touring | Click below to buy my cool '81 LTD:

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    Learning The Ways of Box Town Cars MattsLincoln's Avatar
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    Quote Originally Posted by johnunit View Post
    Something that might be useful is getting a list of what mufflers are "clones" of ones on this list.

    For instance, Thrush Welded mufflers are just Flowmaster 2-chambers with very minor tweeks.

    actually thrush welded mufflers(debut in 1966) where out before the flowmasters[debut in 1983) 2 chamber mufflers. Flowmaster copied thrush and sold it for double the price. but thrush welded are the originals.

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    fair enough.

    The point was that you could expect similar numbers to the flowmaster 2-chambers if you go Thrush Welded. Incidentily, I just bought some Thrush Weldeds...

    85 4 door 351 CV - 160KMs stock and with issues... 4BBL swap and other goodies in the spring...next spring

    06 Mazda 3 hatch 2.3L 5AT (current daily)

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    Learning The Ways of Box Town Cars MattsLincoln's Avatar
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    Quote Originally Posted by johnunit View Post
    fair enough.

    The point was that you could expect similar numbers to the flowmaster 2-chambers if you go Thrush Welded. Incidentily, I just bought some Thrush Weldeds...


    i wont lie to you but the thrush welded mufflers are great. i am pleased with the sound they give and they sound nasty when full throttle.

    1982 Lincoln Continental Mark VI Bill Blass Designer Series 2-Door(Larisa)-Mods: CFI To SEFI Swap COMPLETE, E7 Heads. More to come!!!! Up And Running.

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    "The finder of unobtainium and other magical items" zoomie's Avatar
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    I really like glasspacks.......
    89 townie stock, repairs and upgrades on going..........

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    I have slp lm1's on my car. They sound wicked nasty and flow a ton. But they are not technically mufflers, more like resonators/expansion chambers. But I love them. Though at times I have considered going to the dynomax super turbo to quiet it down some, the slp's get a little over bearing on long trips.


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    Member of the Orb Alliance packman's Avatar
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    Quote Originally Posted by 1987cp View Post
    ....I'd also suggest looking for info on Walker QuetFlows for those who might want a more stockish sound level (not that we know any of those types ... ).
    Do they make these in 2.5" sizes? If I ever replace both of the Summit welded muffs, I might consider these. I'm not sure what caused my Summit muff to fail, but I probably won't use them if I have to re-install the exhaust.


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    The sly one sly's Avatar
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    too bad they didn't have magnaflows in that list. I'd like to see how they compared. I rather like my mellow magnaflows.

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    Quote Originally Posted by packman View Post
    Do they make these in 2.5" sizes? If I ever replace both of the Summit welded muffs, I might consider these. I'm not sure what caused my Summit muff to fail, but I probably won't use them if I have to re-install the exhaust.


    Packman
    I did find a 2.5" offset/offset in the Walker catalog. It's for some '90-ish Cadillac single exhaust application. I've got the PN posted somewhere - I think. If not, I can get it from the catalog again. They're expensiveish (~$95 IIRC), but no more so than many popular "performance" mufflers. Was thinking of getting some when the Super Turbos showed up on closeout at Rock Auto for something crazy like $27 each - and helped me verify that my resonance problem is almost entirely in the pipes.
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    Flow numbers...

    I'd like to see delta p's.
    **1987 Ford CV Tudor; Far from stock, stock from far
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    what's the functional difference? Wouldn't it be at a given CFM, which would indicate a very similar aspect of the restriction caused?

    85 4 door 351 CV - 160KMs stock and with issues... 4BBL swap and other goodies in the spring...next spring

    06 Mazda 3 hatch 2.3L 5AT (current daily)

  17. #17
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    It would be dependent on volumetric flow rate, but to me it is definitely worth mentioning.

    More useful would be a plot of how pressure differential changes as volumetric flow rate increases.
    **1987 Ford CV Tudor; Far from stock, stock from far
    304, GT40P, HO (straight up), 1.7s, Air Gap, 600 DP, MSD, E fans, FRPP Shorties, Flowmaster 10s, Dirty Dog 3400 NLU, Silverox VB, B&M pan, stacked plate cooler, aluminum shaft, 3L73, big brakes/ rear disks, police bars, urethane throughout, 18x9/10 Bullits (F:275 NT555s, R: 305 NT05R DRs). TW170s and AFM N41 in stock and on deck. Faceplated TKO to follow

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