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  1. #1
    Master Mechanic CarpenterGuy's Avatar
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    Jul 2008
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    Leeds, Alabama
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    Default Magnaflow or Flowmaster

    I've been looking at a cat-back exaust system for the future, just planing out. I've been looking at the Flowmaster and the Magnaflow. I like that Flowmaster lets you have two different heads, but i also want something thats going to give me more power and a nice sound. I'm also thinking about cost, but i guess i can sacrifice a little green for a nice system. thanks
    2006 Silverado Z71 - 97,000 - totaled, RIP
    2006 Silverado Z71 - 122,000 (K&N 77 Series CAI, PowerAid TBS, Magnaflow dual rear exit, 33x12.50 Mickey Thompson MTZ, Tuff Country Torsion Keys, Tuff Country Add-A-Leafs)
    1966 C10 swb stepside (Gen I 350, Turbo 400 trans, dual cyl power brakes, front discs)
    I'll keep my money, guns, and freedom. You keep the Change.

  2. #2

    Cool

    my single flowmaster 40 sieres dumped is extremly loud .. i frequently set off car alarms
    very loud i highly recomend it
    and i got 1 mpg better!
    def worth the 200$
    Ryan

    2002 Jeep Wrangler Sport 4x4 (the Yellow Jacket)
    4inch suspension 3inch body
    Straight 6 (383 Stroker within a year)
    36inch SuperSwamper TSL.
    105,000
    Detroit Loccers
    Daily Driver Weekend Wheeler
    much more...

    2004 Sierra crew cab, 2wd, 5.3 V8
    2inch Daystar Leveling kit
    single dumped Flowmaster 40 sieries exaust(removed)
    Mb Blitz Chrome wheels
    Leer Bed Cover(for sale)
    50k miles
    :glasses:




  3. #3
    Master Mechanic CarpenterGuy's Avatar
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    Jul 2008
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    Leeds, Alabama
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    Default

    Quote Originally Posted by 04sierracrewcab View Post
    my single flowmaster 40 sieres dumped is extremly loud .. i frequently set off car alarms
    very loud i highly recomend it
    and i got 1 mpg better!
    def worth the 200$
    Wait, how much was it? How much gain in HP do i get too. Do they make one in dual?
    2006 Silverado Z71 - 97,000 - totaled, RIP
    2006 Silverado Z71 - 122,000 (K&N 77 Series CAI, PowerAid TBS, Magnaflow dual rear exit, 33x12.50 Mickey Thompson MTZ, Tuff Country Torsion Keys, Tuff Country Add-A-Leafs)
    1966 C10 swb stepside (Gen I 350, Turbo 400 trans, dual cyl power brakes, front discs)
    I'll keep my money, guns, and freedom. You keep the Change.

  4. #4
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,356

    Default

    Try hooker aerochambers can find them pretty cheap on ebay, just found out about them and considering them to replace my magnaflow
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  5. #5

    Default

    Quote Originally Posted by 04sierracrewcab View Post
    my single flowmaster 40 sieres dumped is extremly loud .. i frequently set off car alarms
    very loud i highly recomend it
    and i got 1 mpg better!
    def worth the 200$

    alright, i'll admit, I'm still a little green in the gills. Can you tell me what "dumped" means? And how loud is extremely loud?? Like piss off the neighbors loud when you get all over it as you leave the drive way, or wake up the neighborhood as soon as you turn the key??

    I'm wanting a new system and 200 bones aint so bad BUT I'd rather not wear out my welcome around here.
    2004 Chevy Silverado 1500 LS
    -55,000 miles
    -K&N FIPK
    2005 Pontiac Grand Prix
    -24,000 miles
    -K&N FIPK
    2006 Suzuki GSXR600
    -Two Bros V.A.L.E. exhaust
    -Battlax BT-016 Dual Compound Tires

  6. #6

    Default

    Magnaflow or Flowmaster : Pepsi or Coke?

    I'm on my second Flowmaster. The first finally rusted thru, but it lasted 3 times longer than the OE muff. For the second one, I went 3" from the Y to the tip (at the bumper). A hi-flow Magnaflow cat and the "quietest" Flowmaster made. A littler rougher and louder than the original Flowmaster that had a section 2 3/4" pipe between the cat and muff. Changing that short section of pipe to 3" makes quite a difference. Just put on a 4" OD x 10" resonator tip and the wife is happy.
    FYI: The Magnaflow cat failed at my last smog test, and it was barely out of warranty.
    Are we having fun, yet?

  7. #7

    Default

    I just had a Magnaflow cat-back installed and I love it. I went with the single side exit. It sounds good but not too loud. Its just loud enough to be heard at idle but not so noticable at hwy speeds well untill you lay into it, then it opens up. Very noticable seat of the pants increase. Torque is the most noticable to me. Definitly two thumbs up from me.
    2009 Tahoe LT2; Graystone Metallic; 5.3L Vortec; 4x4; Loaded;

  8. #8
    Master Mechanic CarpenterGuy's Avatar
    Join Date
    Jul 2008
    Location
    Leeds, Alabama
    Posts
    994

    Default

    Quote Originally Posted by zippy View Post
    Magnaflow or Flowmaster : Pepsi or Coke?

    I'm on my second Flowmaster. The first finally rusted thru, but it lasted 3 times longer than the OE muff. For the second one, I went 3" from the Y to the tip (at the bumper). A hi-flow Magnaflow cat and the "quietest" Flowmaster made. A littler rougher and louder than the original Flowmaster that had a section 2 3/4" pipe between the cat and muff. Changing that short section of pipe to 3" makes quite a difference. Just put on a 4" OD x 10" resonator tip and the wife is happy.
    FYI: The Magnaflow cat failed at my last smog test, and it was barely out of warranty.
    Down here in Bamy we don't have smog tests, so i'll take anything that meets my needs. I want something that will make my truck sound like a beast and give me a deep tone, something really open. I also want it to give me some more power. I'm not looking for something that blows out the neighbors windows when i back out of the drive way though.
    2006 Silverado Z71 - 97,000 - totaled, RIP
    2006 Silverado Z71 - 122,000 (K&N 77 Series CAI, PowerAid TBS, Magnaflow dual rear exit, 33x12.50 Mickey Thompson MTZ, Tuff Country Torsion Keys, Tuff Country Add-A-Leafs)
    1966 C10 swb stepside (Gen I 350, Turbo 400 trans, dual cyl power brakes, front discs)
    I'll keep my money, guns, and freedom. You keep the Change.

  9. #9

    Default

    i would recommend magnaflow here
    PETE
    95 GMC Sierra 2500
    3" Body Lift, 33" Goodyear MTR's
    5.7L 350 TBI Edelbrock SDT Exhaust, Flowtech Headers, K&N Intake
    Sold :(
    1999 Jeep Cherokee, 3" Rustys lift, 33" BFG MT's, locked, armored: Rolled :(
    2000 Jeep Grand Cherokee Limited. K&N Intake, Custom Kolak Exhaust


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  10. #10

    Default

    i have a single magnaflow ran with 3" and the a 5" dumper and it sounds awsome not to loud but enough to get someones attention
    2004 GMC Sierra
    pace headers
    magna flow muffler
    gm performance intake
    305/70/16 Toyo MT
    16in hello maxx rims
    1987 Chevy K5 blazer
    stock 350
    4" lift 35s

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