View Poll Results: Flowmaster restricts more than stock muffler?

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  • Yes

    32 28.32%
  • No

    81 71.68%
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Flowmaster Restricts more than stock?

This is a discussion on Flowmaster Restricts more than stock? within the External Engine forums, part of the LSx Technical Help Section category; TD's FTW!!!...

  1. #41
    Senior Member 01ws6er's Avatar
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    TD's FTW!!!

  2. #42
    JUISSED Midnight02's Avatar
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    I can't believe that 20 people actually think the Flowmaster mufflers flow WORSE than stock.....this is internet hype at its best!

    I am curious to see if those 20 people can produce any relevant dyno or flow test results that would support that.

    We've seen a bunch of info regarding flow tests as well as dyno results and every single one of them support the Flowmaster muffler being an improvement over the stock setup. That being said, we all recognize that the Flowmaster 80 series design is far from a top performer on the F-body, so at the end of the day go with a catback that meets your needs (whether they are sound OR performance related).
    2002 Camaro SS M6, 2.5 PRC 5.3L heads, TFS 228/230 cam, FAST 92, bolt ons + a 10 lb bottle in the back.


    1989 Corvette L98, A4, Full bolt ons, etc.

  3. #43
    Moderator Firebirdjones's Avatar
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    Yep Midnight,,,,thats exactly what I'm getting at. We did a bunch of dyno sessions when available but did more track testing than anything as I had mentioned in an earlier post.
    It's nothing but internet hype. Somewhere this rumor got started and just expanded from there.
    I have seen more threads pop up lately asking about flowmaster mufflers and it makes me chuckle.
    If I had the ability to post all the dyno graphs with various cat backs along with all the ET slips and log book info we compiled on all this over a 3-4 month period,,,I would ask to make it a sticky and put this myth to rest.
    In a nut shell,,,all the 3 inch catbacks will show very similar results give or take 2-3 HP, (hence not enough to affect ET or MPH really),,,jump to a 4 inch single mufflex and see a significant difference,,,then of course the real dual systems are in a league of there own.
    This is really just beating a dead horse. Just pick a sound and go with it.

  4. #44
    Member Speed Psychosis's Avatar
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    eh, exhaust is the most opinionated mod there is, by far. some people will focus on power more than sound. imo this doesn't let you enjoy the car as much, but their choice.

    yes it might not make a big difference, a few horsepower. but hell, most of our mods are just a few (maf, throttle body, pulley, filter, intake manifold). it all adds up. and it depends on your setup. im will make difference with heads and stock manifolds are the real bottle neck in the exhaust, there's no question there. if you replace them and remove cats and get a tune, flowmasters might have held you back (esp 3 chamber). look a the flow rates on the other page (2). yes its better than stock, but there are much, much better flowing options like the hooker max flow. it would probably take some engine internals to really make a noticeable difference though.

  5. #45
    Moderator Firebirdjones's Avatar
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    The car we tested them all on was a well built Lingenfelter LT1 that put about 430 HP to the rear wheels,,,no slouch,,,but the flowmaster didn't hold it back anymore than any of the other 3 inch catbacks.
    I don't have a problem with them like everyone else seems to.

    Then again, there seems to be quite a few things the internet says is great for 4th gens and I find the opposite, and vice versa.

  6. #46
    Member Z28collection's Avatar
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    flowmaster

    anything out there aftermarket has got to flow a little better than stock whether it be a couple of horsepower or 15 - 20 horses.

  7. #47
    LTX N20LT4's Avatar
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    People can keep arguing all day about which exhaust system is better, and there will never be a definite answer to the debate. Exhaust is all about preferance. Yes I have had flowmaster systems and they did prove to be restrictive, but it wasn't nothing a flip of a switch to my e-cutout couldn't handle. It's all about which one you like. I spent $715 on my B&B Tri-Flo system because I loved the sound of a buddies '96 LT4 Corvette, and I never regret buying it. But the main poll topic of this thread is very halarious to me: Is a Flowmaster more restrictive than stock muffler? Come on now, that's just a bizarre question.

  8. #48
    Member fast enough Z28's Avatar
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    Although I don't like the sound of my flowmaster my dyno numbers proved to me that it couldn't be that bad. I am switching to a magnaflow but only for sound not looking to gain much.

  9. #49
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by fast enough Z28 View Post
    Although I don't like the sound of my flowmaster my dyno numbers proved to me that it couldn't be that bad. I am switching to a magnaflow but only for sound not looking to gain much.
    There ya go, exactly. I think most of the flowmaster smack talk is heresay,,,,most of the naysayers have never compared them on an actual dyno or track testing to other like systems.

  10. #50
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by N20LT4 View Post
    People can keep arguing all day about which exhaust system is better, and there will never be a definite answer to the debate. Exhaust is all about preferance. Yes I have had flowmaster systems and they did prove to be restrictive, but it wasn't nothing a flip of a switch to my e-cutout couldn't handle. It's all about which one you like. I spent $715 on my B&B Tri-Flo system because I loved the sound of a buddies '96 LT4 Corvette, and I never regret buying it. But the main poll topic of this thread is very halarious to me: Is a Flowmaster more restrictive than stock muffler? Come on now, that's just a bizarre question.
    I agree,,,just the posts alone on flowmasters lately is all bizarre to me.

  11. #51
    Member TRANS-DAD's Avatar
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    Hey Fast,
    Going From Flows To Magnaslow Is Guna Suck
    Uha............ Unless You Like The Sound Of Stock Exahust!!!

  12. #52
    Member fast enough Z28's Avatar
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    Quote Originally Posted by TRANS-DAD View Post
    Hey Fast,
    Going From Flows To Magnaslow Is Guna Suck
    Uha............ Unless You Like The Sound Of Stock Exahust!!!
    I've got lt's and ory!

  13. #53
    Member TRANS-DAD's Avatar
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    Yhea,
    Still Gona Be Quiet But If It's A Dd That's Cool!!
    (my 02 Dodge Ram W/stock Exahust Sounded Better Than My 01 T/a W A
    Magnaflow!! ) J M O

  14. #54
    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by TRANS-DAD View Post
    Yhea,
    Still Gona Be Quiet But If It's A Dd That's Cool!!
    (my 02 Dodge Ram W/stock Exahust Sounded Better Than My 01 T/a W A
    Magnaflow!! ) J M O
    magnaflow is not going to be quite with headers and catless y pipe.
    ive had above and its nowhere near quite unless your deaf
    2000 nhra edition formula
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  15. #55
    Member TRANS-DAD's Avatar
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    Quote Originally Posted by nhraformula View Post
    magnaflow is not going to be quite with headers and catless y pipe.
    ive had above and its nowhere near quite unless your deaf
    OK, YOUR RIGHT AT LEAST FROM 4000 RPMS AN UP!!!

  16. #56
    NIUK! NIUK!..WOO!WOO!WOO! LIGHTNINGMCQUEEN's Avatar
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    No, i agree with Trans-Dad. Magnaflow doesnt have a noticable exhaust note. Same thing as Stock Muffler.

  17. #57
    Member 98 Stang Killer's Avatar
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    how good does the loud mouths sound i heard it on ls1 sounds but want some opinions before buying

  18. #58
    Member Speed Psychosis's Avatar
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    ^ i just ordered it an hour ago. but my car is running rich which destroyed all my cats and all oxygen sensors so i have to get a tune before i show any videos or drive it. afterwards, i can show u a vid of anything u want.

    but in the meantime, these are the 3 vids that convinced me.

    watch this guys 2 vids.
    http://youtube.com/watch?v=RFiEkJxmcX8

    and watch this one. boring until about 50 seconds into video.


    there are a lot of complaints of drone, but also a lot of great compliments. also, most complaints were from either people with headers (if you plan on getting some you might want to reconsider, way too loud and raspy) or they have an a4. m6 people naturally have less drone since we cruise at 60 at like 1500 rpm.

  19. #59
    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by LIGHTNINGMCQUEEN View Post
    No, i agree with Trans-Dad. Magnaflow doesnt have a noticable exhaust note. Same thing as Stock Muffler.
    when you have headers and off road pipe, i dont see how anybody can say its like stock.

  20. #60
    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by 98 Stang Killer View Post
    how good does the loud mouths sound i heard it on ls1 sounds but want some opinions before buying
    reminds me of a garbage truck

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