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Knocking after Header install??

This is a discussion on Knocking after Header install?? within the External Engine forums, part of the LSx Technical Help Section category; I have noticed a knocking coming from underneath (sounds like its under the center console) sometimes under hard acceleration ever ...

  1. #1
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    1999 Trans-Formula

    Knocking after Header install??

    I have noticed a knocking coming from underneath (sounds like its under the center console) sometimes under hard acceleration ever since my LTs were installed I thought it was the exhaust banging underneath the car but its pretty snug anybody else have this or know how to fix it

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    TJEA Retirement Home Dr.Crash's Avatar
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    does it change with speed or RPM's?

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    Life in the Fast lane sunsetorangess's Avatar
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    Met. Sunset Orange
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    Its your Y-pipe, you will either have to have it cut and weld in a new piece that is angled down, heat it up and bend it away from the floor or pick up a mufflex bumpstop...
    J
    2001 SS, Its not the car its the Driver that matters....

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    TJEA Retirement Home Dr.Crash's Avatar
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    i haed a problem like that and it was my y-pipe but it was hitting my tunnel brace

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    Quote Originally Posted by sunsetorangess View Post
    Its your Y-pipe, you will either have to have it cut and weld in a new piece that is angled down, heat it up and bend it away from the floor or pick up a mufflex bumpstop...
    J
    Thanks I think I will check into the bumpstop someone said changing my mounts to poly would stop it as well

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    TJEA Retirement Home Dr.Crash's Avatar
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    ya i changed my tranny mount to poly and noticed a huge difference

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    I was told changing the motor mounts to poly would also reduce the banging of the y pipe

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