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Slp loudmouth

This is a discussion on Slp loudmouth within the GTO forums, part of the Vehicle Specific category; So I love that the loudmouth is loud but I don't like how it sounds like it's flowing too fast ...

  1. #1
    T/A=LOTS of Vagina =X
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    Dark Blue
    98 Trans Am =]

    Slp loudmouth

    So I love that the loudmouth is loud but I don't like how it sounds like it's flowing too fast during idle. How can i change that so it doesn't sound like this and also what can i do to keep some back pressure?

  2. #2
    Member derbs's Avatar
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    IBM
    04 GTO

    WTF do you mean????? the loudmouth 1 sounds bad ass. If you don't like it get a magnaflow catback or replace them with LM 2's.

  3. #3
    T/A=LOTS of Vagina =X
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    Dark Blue
    98 Trans Am =]

    My main concern is the back pressure i don't wanna lose a lot of low end torque

  4. #4
    Member derbs's Avatar
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    IBM
    04 GTO

    guess I'd have no idea because I'm running my LM1 with lt's.

  5. #5
    Smiles for 9.5 Years cammed goat's Avatar
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    Phantom Black Metallic
    2004 GTO M6

    Running LM1 catback and love it. Getting catted LTs in the future.

  6. #6
    King of Lurkers ne0fiend's Avatar
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    |||||||||||||||||||||||||
    04M6 GTO

    I'll play the devil's advocate here -
    In 2005 the only performance exhaust available for the 04-M6 was either Flowmaster (around $1,500) or SpinTech ($90 a can).
    I opted for the SpinTech with a true-dual style build.
    I deleted the resonators, and both cats and did away with all intention of running an off-road pipe. The back pressure I lost with the SpinTech build was negligible and I reduced stock exhaust manifold temperature by 15%; cooler exhaust, cooler engine bay, cooler air feed and we all know cooler air = a denser fuel:air mix = more horse power.

    If you are worried about the back pressure, but want to stick with the SLP setup, I suggest adding an H-pipe/off-road pipe. That will restrict the output a little and slow down the exhaust flow.
    Of course another option is to use a 2 1/4 exhaust pipe and have the muffler shop bend a transition/taper into the pipe just after the header/manifold flange. This restricts and slows down flow.

    Hope that helps.








    Last edited by ne0fiend; 07-08-2010 at 05:26 PM.

  7. #7
    T/A=LOTS of Vagina =X
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    Dark Blue
    98 Trans Am =]

    But I run the loudmouth 1 with LT's won't it get raspy?

  8. #8
    Smiles for 9.5 Years cammed goat's Avatar
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    Phantom Black Metallic
    2004 GTO M6

    I have heard catless LTs will be raspy with the LM-1.

  9. #9
    Member derbs's Avatar
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    IBM
    04 GTO

    I like the sound of mine with the yank pro thruster 4k the car doesn't sound like I'm running coffee cans like some cars I've heard.. Tomorrow I'll be taking a nice road trip and maybe I can get a vid of how it sounds for you guys.

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