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long tubes fail performance expectations

This is a discussion on long tubes fail performance expectations within the External Engine forums, part of the LSx Technical Help Section category; I just finished installing dynatech's longtube header system on my 99 formula, and i am somewhat dissapointed w/ the performance ...

  1. #1
    Member Jon7I2's Avatar
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    Navy Blue Metallic
    99 Formula M6

    long tubes fail performance expectations

    I just finished installing dynatech's longtube header system on my 99 formula, and i am somewhat dissapointed w/ the performance results. However, i still have a stock catback exhaust system, and i think that is probably severely hindering the long tubes performance potential. Is this true? I plan to get a cutout soon, so that should let me know for sure. And also, the lowest point of my y-pipe is only 3 inches off the ground on a stock height F-body. is that right? Everything else seems to be running fine though, no check engine lights or anything like that. Any help would be great. thanks.

  2. #2
    Senior Member Hurley711's Avatar
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    414 RWHP 395 RWTQ
    00 Black Ram Air Trans Am

    Yes and yes and yes...how many q's were there again??? 3 inches is normal on height......stock catback and headers??? Why??? Yes cutout will help you greatly, dyno with it open and closed and post up some results, I'm betting you gain 15-20 over stock CB

  3. #3
    member since may 2000 nhraformula's Avatar
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    black
    2000 nhra edition formula

    with long tubes and a tune, i gained 30 rwhp.
    get rid of the stock exhaust
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  4. #4
    Blown, Stroked, & Sprayed

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    Yes get rid of the stock exhaust and get it tuned.
    Black 1999 Blown Convertible A4
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  5. #5
    Senior Member INMY01TA's Avatar
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    Keep the stock catback and get a cutout. Ohh, and, get it tuned.

  6. #6
    Rollo Tomassee AKIRA's Avatar
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    Hah, Its been 4 years since my full exhaust install (Hooker Super comps, coated) and ive never had a tune. I want one, but I dont understand why tunes cost so much $$.

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