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how bad really is flowmaster???

This is a discussion on how bad really is flowmaster??? within the External Engine forums, part of the LSx Technical Help Section category; ok heres the deal. i just picked up a 01 6speed z28 w 53k on the clock. mods: lid pacesetter ...

  1. #1
    HUNTER S. THOMPSON FAN Raoul-Duke's Avatar
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    how bad really is flowmaster???

    ok heres the deal. i just picked up a 01 6speed z28 w 53k on the clock.

    mods:
    lid
    pacesetter lt's w 3 inch ory no cat
    flowmaster catback

    i was goin to get rid of the flowmaster because i know how they are pretty restrictive. i wwwwas gonna go w a x-pipe true dual setup and dump before the axle..bbbut not gettin the dual setup would save me 600 bucks...

    SOOO how much power would i really gain with a true dual setup like i just said vs. what i have right now??? is it worth it?....also im not planning on camming this car...
    01 m6 z28 - lid / lt headers / 3' ory w no cats / flowmaster catback w 3' dmh e-cutout / nelson pcm tune

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    It isn't noticeable. 3-4RWHP is only noticeable on the dyno or at the track. And that is all the Flowmaster would restrict over another better flowing catback.

    Although with a good true dual set-up, you would pick up 15 (or so) RWHP over any catback.

  3. #3
    HUNTER S. THOMPSON FAN Raoul-Duke's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    It isn't noticeable. 3-4RWHP is only noticeable on the dyno or at the track. And that is all the Flowmaster would restrict over another better flowing catback.

    Although with a good true dual set-up, you would pick up 15 (or so) RWHP over any catback.
    wow 15rwhp huh?? i also imagine it really benefit with a good pcm tune too huh?? maybe i will go w the true duals

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    Senior Member OnEbAdReDSS's Avatar
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    hey luos it also depends on what flowmaster it is (series)

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by OnEbAdReDSS View Post
    hey luos it also depends on what flowmaster it is (series)
    True.

    Good or bad though, they are still all within a few HP of each other. At least on a mostly stock car.

  6. #6
    Senior Member OnEbAdReDSS's Avatar
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    ya i know i got more with my 40 series than the flowmaster but then again if you go look up the design of the 40's series its like having a cut out but with a little sound deading

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    LTX N20LT4's Avatar
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    My car showed 12-14 rwhp difference from closed exhaust vs. open (cut-out) on the nitrous when I had the Flowmaster Force II 3" inlet/dual 3" outlet system (not sure what series that is, I think '80'). I made 3 runs a piece in both configurations. The car felt VERY restrictive and averaged roughly .2 slower times in the quarter-mile with the cut-out closed. I've then switched to a B&B Tri-Flo and haven't dyno'd it yet, but can tell you there is not nearly as much of a difference between open & closed as it was before. This is an LT1 car, so LS1 results would probably be different.
    Last edited by N20LT4; 06-09-2008 at 02:02 PM.

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    Member Speed Psychosis's Avatar
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    since you have headers, there should be a great difference. i'd guess 15 at least with a good tune. also, texas speed has the cheapest dual exhaust im aware of. its about $450 and is dual 3" dumped. might want to look into that.

  9. #9
    member since may 2000 nhraformula's Avatar
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    hmm, 12 h.p = 2 tenths.
    above does not sound right
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

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    Veteran 0rion's Avatar
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    I've ran a flowmaster catback on mine for years and years and have an e-cutout on it too. I don't sweat a few HP here and there. I like the sound of it. If I want it less restrictive I just crack the cutout open a little bit.

  11. #11
    LTX N20LT4's Avatar
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    Quote Originally Posted by nhraformula View Post
    hmm, 12 h.p = 2 tenths.
    above does not sound right
    Note I said "roughly" (I bolded it this time to make sure you understood). It was actually .16, put it closer to a tenth if you wan't to

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