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  1. #1

    Default Magnaflow vs Flowmaster

    Get some thoughts out there. I used to have an 01 Silverado which I put Flowmasters on. I was in love with the deep rich tone. On my newer 08 Silverado, when I went to add the Flowmasters on, I was warned by the mechanic that Flowmasters were getting tons of unhappy folks with the sound it gave when the truck went from 8 cyl to 4 cyl. He strongly suggested that I go with Magnaflow, which I did.

    The sound is produces is "okay", a "B". I am not in love with the sound as I was with the Flowmasters on my 01.

    My question is, am I better on with a "B" sounding Magnaflow, or should I have gone with the Flowmasters????

  2. #2


    Theres been alot of members on this site complain about the same issue. I think, key word here THINK someone on this site installed a Corsa exhaust that was designed for the DOD engines.

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.

  3. #3


    I do remember reading that the Coras is tuned for the DOD. They are not cheap!!

    ________2013 4C Rated__________

  4. #4


    yeah the magnaflows are a quieter rumble until you punch it, but lots of complaints on sound with cylinder DOD. Same as stated above on the Corsa
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  5. #5
    stephan's Avatar
    Join Date
    Sep 2010
    Far West, Oregon USA,
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    X2, the Magna Flows & the Flowmasters sound equally good according to all the members who have used these. The problem is not with the mufflers, but the fact that the engines just sound like sh!t when they switch to 4 cyl. Can't give an opinion on the Corsas cuz I haven't ridden in one with a Corsa when it switched over to 4 cyl & also can't figure out how they could chamber it so it would sound good on both 4 & 8. Anybody else know this??
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  6. #6


    Just picked up a Flowmaster 50 delta, and a nice stainless magnaflow tip. Now just need to install it
    '08 black death silverado LT
    '00 Ford Ranger XLT

  7. #7
    Caddiac's Avatar
    Join Date
    May 2011
    Upstate South Carolina
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    I love my Flowmaster but then again I do not have to worry about my engine switching to 4 cylinders. If it does, I have more to worry about than the engine sounding like sh!t.
    86 911 Porsche Carrera
    98 K1500 Suburban LT
    2012 Nissan Leaf

    ​General Motors.
    Because life is too short to drive a Ford

  8. #8


    Magnaflow is going to be my future purchase but it really comes down to what tone you like.

    04 Silverado Ext-Cab 2wd LS w/ 5.3L
    Spectre Performance CAI
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  9. #9


    i agree with jb. i mean i have a flowmaster super 40 duel in duel out on my 03. i like it but i'm not a huge fan. my other truck had duel glasspacks and i love glasspacks because of that. i prefer glasspacks over anything

  10. #10


    Just throwin my two cents out there, but while cruisin down the interstate and the truck kicks into 4 cylinders enjoy the switch over. Course to me it sounds like a prop plane at cruising speed, but I also have aviation on the brain. In all honesty, the wife likes the sound too as the deeper tone lulls her to sleep on long trips. Just goes to show there's different strokes for different folks!

    2010 GMC Sierra 1500 SLE Extended Cab Z71 4X4 5.3L Flex Fuel
    MagnaFlow single in duel out system
    Volant CAI & Ram Air Scoop with Power Core Filter
    Rhino Tuff Grip Spray in Bed liner
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    Diablo Trinity with Diablew Tune

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