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About Exhaust...or lack there of

This is a discussion on About Exhaust...or lack there of within the General Help forums, part of the LSx Technical Help Section category; ok so me and a few of my friends are having a little argument..and i figure you guys know best. ...

  1. #1
    Impounded
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    About Exhaust...or lack there of

    ok so me and a few of my friends are having a little argument..and i figure you guys know best.

    they say if you take the exhaust off (example cut it mid y-pipe or just dump it after the stock cats) that it will mess up your engine unless you get a tune

    i sided with that it doesnt because some people dont even run a tune after exhaust mods...

    am i wrong?

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    Not wrong.
    And certainly isn't 'messing up the engine.'

    Probably not making anymore power that way, but not breaking/hurting anything.

  3. #3
    Impounded
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    ^^^
    thats what i said
    i told them that the only reason for a tune is to maximize the gains of the exhaust
    which...frost offers a damn good price nonetheless...

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    if you loose anything it will be a little low end torque by not having a lot of back pressure

  5. #5
    Grand Imperial Wizard Sarge's Avatar
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    DaveyG is right on the money. Back pressure = Torque.

  6. #6
    Firebird Encyclopedia 9T8W66's Avatar
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    Quote Originally Posted by Davey G View Post
    if you loose anything it will be a little low end torque by not having a lot of back pressure
    Quote Originally Posted by Sarge View Post
    DaveyG is right on the money. Back pressure = Torque.
    These guys are correct.
    I had some personal experience with my old Pontiac 400.
    It always seemed to have header leaks at the flange (until I finally solved it). When it did leak you could feel a noticeable difference in torque output from the engine.
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  7. #7
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    So how do Kooks 1 7/8 LTs 3" ORY and SLP LMII do in terms of torque?
    I mean i figure that a dyno would be needed to exacts...but shouldnt it go up?

  8. #8
    The Demon Demon_Z28's Avatar
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    Quote Originally Posted by BashamWS6 View Post
    So how do Kooks 1 7/8 LTs 3" ORY and SLP LMII do in terms of torque?
    I mean i figure that a dyno would be needed to exacts...but shouldnt it go up?
    yes you total torque gains will be up in the higher rpms, regardless of losing a little bit of low end off the hit in the power band you will pick up hp and torque in the power band. I have seen this first hand from being stock to full exhaust on the same dyno and picked up more torque a little later in the power band. so the power curve isn't as strong off the hit but it does gain torque.

  9. #9
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    Quote Originally Posted by BashamWS6 View Post
    So how do Kooks 1 7/8 LTs 3" ORY and SLP LMII do in terms of torque?
    I mean i figure that a dyno would be needed to exacts...but shouldnt it go up?
    That exact set-up is the only power mod I have on my car other than a lid. I'm a M6.

    I DYNO'd 330rwhp/342rwtq through a 9" rear end, which is the least efficient rear end there is...so I know I left some on the table.

    Those numbers were from a Mustang Dyno too. A DYNOJET would have read higher.

    I didn't get a baseline run in with the car stock, but I would assume I gained close to 35/40 from other numbers I've seen on stock cars.

    The important thing is that you have a car that is running properly. Don't get caught up in the numbers.

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