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; Once and for all i want to know if the Flowmaster muffler restrics more than stock....

  1. #1
    NIUK! NIUK!..WOO!WOO!WOO! LIGHTNINGMCQUEEN's Avatar
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    BLACK
    1999 TRANS AM

    Flowmaster Restricts more than stock?

    Once and for all i want to know if the Flowmaster muffler restrics more than stock.

  2. #2
    Formula Driver! 96Firebirdformula's Avatar
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    Batman Black
    1996 Formula

    Doubt it flows worse.

    My dad wanted me to get flowmaster but i told him im geting magnaflow instead

  3. #3
    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    I think their single chambers are almost as good as a cutout.

    Dyno Proven

    Ive got the american thunder and I love it..

  4. #4
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    2001 WS6, 2003 SRT4(sold)

    YES, assuming this poll is about the 80 series. I know from seat of the pants experience. Flowmaster 80 series muffler is the worst for performance.

  5. #5
    Member SAGGIN's Avatar
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    02 SS, 03 BMW 745

    If they do take form horsepower over stock It can't be more than 2-5hp if that.

  6. #6
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by JoshieDoom View Post
    I think their single chambers are almost as good as a cutout.

    Dyno Proven

    Ive got the american thunder and I love it..
    Damn near ANY other catback would gain you a few ponies.


    Flowmaster outflows stock. But is the bottom of the barrel for aftermarket flow numbers.

  7. #7
    Member Speed Psychosis's Avatar
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    98 T/A M6 w/lid and LM1

    if it does it isn't noticeable. buy it for the sound. if performance is a concern, you should be looking at duals.

  8. #8
    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    A guy right down the road from me has a straight pipe true dual(with x pipe) setup and with dual single chambers it only reduced output by 2 horsepower and no torque loss.

    The 80s series sucka da wee wee tho

  9. #9
    Dcdrummer LS1buckey's Avatar
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    pewter
    1999 Pontiac Trans Am

    I don't buy a muffler for power gains, thats why I did LT's and an engine tune flowmaster flows more freely but it's the sound you should be going for when buying an after market muffler IMO.

  10. #10
    🤔 11s. blackbirdbrain89's Avatar
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    black trans am
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    un less u have a 98 single pipe ls1 then your stock muffler flows better then the flowmaster 80 s, imp they sound like crap and they make ls1's soune like 3.8 v6s. if any one cares to look it up maganflow is the best flowing and imp best sounding. close 2nd is borla not as loud but deep tone and flows close to magnaflow slp is junk as well

  11. #11
    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by blackbirdbrain89 View Post
    un less u have a 98 single pipe ls1 then your stock muffler flows better then the flowmaster 80 s,
    above is bullshit.
    when speed inc swapped out my muffler back in 2000, they welded in a flowmaster 80 series into the stock piping.
    on back to back dyno pulls, the flowmaster 80 made 7 rwhp over the stock set up.
    while the flowmater 80 series isnt the best flowing muffler out there, its better than stock.
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  12. #12
    NIUK! NIUK!..WOO!WOO!WOO! LIGHTNINGMCQUEEN's Avatar
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    Quote Originally Posted by blackbirdbrain89 View Post
    they make ls1's soune like 3.8 v6s.
    ???? ......no way.

  13. #13
    Senior Member 01ws6er's Avatar
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    Quote Originally Posted by JoshieDoom View Post
    I think their single chambers are almost as good as a cutout.

    Dyno Proven

    Ive got the american thunder and I love it..

    I have td's with single chambers and they are 6 1/2" inlet to outlet. They sound really good, and my god are they loud! I was gonna go Magnaflow, but changed my mind at the last second.


    Quote Originally Posted by nhraformula View Post
    above is bullshit.
    when speed inc swapped out my muffler back in 2000, they welded in a flowmaster 80 series into the stock piping.
    on back to back dyno pulls, the flowmaster 80 made 7 rwhp over the stock set up.
    while the flowmater 80 series isnt the best flowing muffler out there, its better than stock.
    Nice to see someone put up #'s before bashing them. My friend had a muffler shop gut his 80 series and it made the sound/seat of pants power so much better.

  14. #14
    Junior Member Mastermindc3pro's Avatar
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    Flowmasters just dont flow baby

  15. #15
    Senior Member 01ws6er's Avatar
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    So you mean to tell me that a 6 1/2" long (4"case btw) muffler that is completely open except for a little v in the middle isn't gonna flow? I assume you are talking about the 80 series.... I will be putting my car on the dyno soon so I'm interested to see how freely they "do not flow"

  16. #16
    Member Ls1_385hp_T/A's Avatar
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    Quote Originally Posted by Mastermindc3pro View Post
    Flowmasters just dont flow baby
    Alright austin powers....super 40/ super 44 seem to be pretty good

  17. #17
    Think Spring..... 4get gto's Avatar
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    As of right now the poll says Flowmaster 63 % other 33%........???????

    Whats are thoughts on that guys ??????????????????



    I have the Flowmaster and think it sounds like one of the best....
    As far H.P. goes you could'nt prove otherwise.............
    2000 NBM WS6

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  18. #18
    Member Speed Psychosis's Avatar
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    98 T/A M6 w/lid and LM1

    ^ flowmaster is proven do be worse with flow. not by dynos, but actually measuring air flow accurately. however, exhaust should always have sound as first priority. if you aren't looking at getting headers anytime soon, i'd suggest a loudmouth 1 or 2, or bassani if you like it deep. but its all preference.

  19. #19
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by Speed Psychosis View Post
    ^ flowmaster is proven do be worse with flow. not by dynos, but actually measuring air flow accurately. however, exhaust should always have sound as first priority. if you aren't looking at getting headers anytime soon, i'd suggest a loudmouth 1 or 2, or bassani if you like it deep. but its all preference.
    Personally...I am performance minded.

    I pick an exhaust with performance in mind.
    Then pick according to sound.


    Although...nothing but Magnaflow for me now.
    I can't seem to find it, but there is a flow chart of popular mufflers. Flowmaster is always at the bottom.
    Does that relate to lower dyno numbers and ET's??? Probably. I am sure it depends on the set-ups.

  20. #20
    Member Speed Psychosis's Avatar
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    Red
    98 T/A M6 w/lid and LM1

    ^ I believe there is a chart on ls1sounds.com

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