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HELP!!! need cutout diameter for stock car

This is a discussion on HELP!!! need cutout diameter for stock car within the External Engine forums, part of the LSx Technical Help Section category; i was thinking about buying a cutout for my I pipe after the Y but i dont kno what size ...

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    02 z28 vert M6

    HELP!!! need cutout diameter for stock car

    i was thinking about buying a cutout for my I pipe after the Y but i dont kno what size to get......i was thinking it was the 2.5 but i want to be 100% shure, i own a 02 z28 vert....soo? the say on ls1 tech to get a 3.0inch but??? now im thinking if just the opening is 3.w/e

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    no more 4th gen secondgearscratch's Avatar
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    Quote Originally Posted by First Spray777 View Post
    i was thinking about buying a cutout for my I pipe after the Y but i dont kno what size to get......i was thinking it was the 2.5 but i want to be 100% shure, i own a 02 z28 vert....soo? the say on ls1 tech to get a 3.0inch but??? now im thinking if just the opening is 3.w/e
    do you have headers?

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    Navy Blue Metallic
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    3" is correct
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    no no headers,....just the stock shorties, but i want it on the I pipe soo its 3inchs right? lol....whats a good store also? my g/f orderd a LId from Ws6store.com n it hasnt gotten here yet (march 11th it said shipped) so i dont kno if i should buy the cutout fromt here

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    did you end up getting the cutout?

    just wondering what size worked for you. I have a cutout on mine but not sure what size it is. I want to add the electric valve to it but not sure on the size.

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    Veteran 0rion's Avatar
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    I see they told him 3" but I'm almost positive that the stock stuff is 2.5". Could be wrong but I'm pretty sure stock size is 2.5".

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    Quote Originally Posted by 0rion View Post
    I see they told him 3" but I'm almost positive that the stock stuff is 2.5". Could be wrong but I'm pretty sure stock size is 2.5".
    you are correct. i just measured the i pipe 2 days ago.

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    The stock i-pipe is 2.75". 3" cutouts are perfect for stock piping, it slips over nicely and can be easily welded.

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