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Is Flowmaster All That Bad?

This is a discussion on Is Flowmaster All That Bad? within the External Engine forums, part of the LSx Technical Help Section category; with a 40 series muffler are there horsepower being robbed compared to others?most catbacks are basically the same just consisting ...

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    Member blackls1ta's Avatar
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    Is Flowmaster All That Bad?

    with a 40 series muffler are there horsepower being robbed compared to others?most catbacks are basically the same just consisting on sound you prefer, around 10-15 hp on most catbacks?

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    If you go with the 3" in/duall 3" out, there is no problem with lost horsepower. It is the 3" in/dual 2.5" out that causes restriction. I have seen it on a dyno compared to a couple more popular free flowing systems.
    I am unsure what 40 series system you are talking about?

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    Member blackls1ta's Avatar
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    american thunder 3in catback

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by blackls1ta View Post
    american thunder 3in catback
    That is an 80 series. Go with all 3"

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    old timer blue02Z's Avatar
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    80 series blow bawls. they are the crossflow and they aren't all that much better than stock from what i've heard. i've got a magnaflow made for an f-body and before i put it on i held it up and you can see light come thru, its a good flowing muffler

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    Member blackls1ta's Avatar
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    40 series has the agressive sound and flows good i hear not talkin bout 80 series

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by blue02Z View Post
    80 series blow bawls. they are the crossflow and they aren't all that much better than stock from what i've heard. i've got a magnaflow made for an f-body and before i put it on i held it up and you can see light come thru, its a good flowing muffler
    Yes, Magnaflow is a good flowing muffler. Just because you can't see light through the other end doesn't mean it doesn't flow good.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by blue02Z View Post
    80 series blow bawls. they are the crossflow and they aren't all that much better than stock from what i've heard. i've got a magnaflow made for an f-body and before i put it on i held it up and you can see light come thru, its a good flowing muffler
    Exactly, from what you have heard, not what you know for a fact!

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    old timer blue02Z's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    Exactly, from what you have heard, not what you know for a fact!
    i know its hearsay, but i used to have a flowmaster 80 series, i didnt care too much for it, i like the other mufflers flowmaster makes, just not the crossflow 80 series.

    also, i didnt mean that cuz i can see thru it it flows well, just saying that it is free flowing, as proof. there are alot of good free flowing catbacks out there.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by blue02Z View Post
    i know its hearsay, but i used to have a flowmaster 80 series, i didnt care too much for it, i like the other mufflers flowmaster makes, just not the crossflow 80 series.

    also, i didnt mean that cuz i can see thru it it flows well, just saying that it is free flowing, as proof. there are alot of good free flowing catbacks out there.
    Very True!!

    Flowmaster gets its shitty reputation with the F-Body croud because of its sound, or its lack of the famous Flowmaster sound.

    I have some dyno sheets from tests, let me see if I can scan them and post them.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by blue02Z View Post
    also, i didnt mean that cuz i can see thru it it flows well, just saying that it is free flowing, as proof. there are alot of good free flowing catbacks out there.
    Size of the muffler, location, design, and the # of tailpipes has alot to do with sound and flow.

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    old timer blue02Z's Avatar
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    that is true, very true

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    idk, i have 40 series flowmaster, love the flow, the love the sound! i'm 3" all the way back tho w/ cutouts

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    Quote Originally Posted by NE98LS1 View Post
    idk, i have 40 series flowmaster, love the flow, the love the sound! i'm 3" all the way back tho w/ cutouts
    Is there a 40 series for the FBody? 80 is all I could find...

    Ended up going with a Flowsound.

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    The Bandit Wesman's Avatar
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    Whatever you do don't get a Flowmaster 80 series. I just tossed my Flowmaster 80 in the garbage, it was a piece of shit. It was very quiet, and the damn thing had to have weighed at least 20lbs. Its nothing but tons of baffles and restrictions inside of it, looks like a hedge maze lol.

    I went with straight through Magnaflow mufflers for my new setup, and they sound great. Plus they are zero restriction, since there are no baffles to obstruct the exhaust flow.

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    The Bandit Wesman's Avatar
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    Quote Originally Posted by SethVIII View Post
    Is there a 40 series for the FBody? 80 is all I could find...

    Ended up going with a Flowsound.
    Not in a catback system, Flowmaster only offers the 80 series "crossflow" for F-bodies.

    If you want to use 40 series, you'd have to go custom.

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    when I seen the title of this thread, all I could think to myself is... MUSTANGS. lol.

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    Quote Originally Posted by NE98LS1 View Post
    idk, i have 40 series flowmaster, love the flow, the love the sound! i'm 3" all the way back tho w/ cutouts
    did you get muffler separate or in catback kit? thanks for response id like 3"too

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    Member blackls1ta's Avatar
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    i know when i had my lt1 ta i got american thunder catback had 40 series muffler next best thing to race muffler and it sounded good and ran well

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by blackls1ta View Post
    i know when i had my lt1 ta i got american thunder catback had 40 series muffler next best thing to race muffler and it sounded good and ran well
    Yeah, thats a single in/single out

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