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Novice Exhaust Question "Y" Pipe

This is a discussion on Novice Exhaust Question "Y" Pipe within the External Engine forums, part of the LSx Technical Help Section category; Yip I read the threads and will risk the butt chewing and ask a question. I have a Hooker CB ...

  1. #1
    Member 89LX's Avatar
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    Navy
    2000 Z28 M6

    Novice Exhaust Question "Y" Pipe

    Yip I read the threads and will risk the butt chewing and ask a question. I have a Hooker CB Aerochamber on my 2000 Z28. The installer said I need a "Y" Pipe to free-up more flow. I see the term "Off Road" Y Pipes by SLP and others. Why are they called "Off Road" (something illegal for street)? I see the sales sites don't mention anything about emissions so assume this portion of the system is unaffected in that respect. I can easily see why a round pipe will flow better than a flat one. I would like to keep my sensors in place and stock headers for now. Thanks for the help.
    2000 Z28
    M6
    SLP Lid
    Smooth Bellows
    Hooker Aerchamber CB

  2. #2
    Junior Member Schweet97Z's Avatar
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    Mystic Teal
    1997 Camaro Z-28

    yes ory pipes are illegal. they dont contain cats. in my opinion there not worth the money when used with manifolds. save ur money for when u get headers..or do another mod.

  3. #3
    Member 89LX's Avatar
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    Navy
    2000 Z28 M6

    SLP Ad says "SLP's Y-pipe assembly is available for 2000-2002 Camaro/Firebird with V8 engines. Manufactured from 2-1/2" O.D., 409 SS tubing, it is mandrel bent for smooth, clean bends with superior flow characteristics. This Y-pipe assembly is designed to replace the "flat" factory pipe (behind the stock catalytic converters) and bolt to your stock exhaust manifolds." So am I to believe my cats are up stream and not affected? Maybe my first post wasn't very clear. They (SLP) further state up to 10 WHP gains possible. What do you think? Thanks

  4. #4
    Life in the Fast lane sunsetorangess's Avatar
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    Met. Sunset Orange
    01 SS

    Well it says it bolts too your manifolds so im guessin it eliminates your cats. Gonna have to call slp for more info. If your just tryin to replace the y and leave the cats then save your money. You wont feel any difference and if anything you will just create a headache from replacing factory y. Just my op. thou
    J
    2001 SS, Its not the car its the Driver that matters....

  5. #5
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    NBM
    2002 Z28

    No, the SLP Y was designed to go on after the stock cats and manifolds. The only difference between it and the stock Y is that the stock Y is flattened under the drivers side for clearance, but some flow tests (and not a few lengthy discussions on fluidic mechanics) about three years ago determined that you really don't gain anything with it. The GM engineers did a good job with the design of the pipe and it flows as good as you could want on stock manifolds and cats. All using the SLP pipe (or any other Y that is "legal") does is loose you an inch or two of ground clearance and a few hundred dollars.

    That being said, technically any other header/y-pipe combo besides shorties is federally illegal, since federal regulations state that it's illegal to move the catalytic converter any farther from the cylinder head than it was when it left the factory.

    However, if you're registered in NC, most of the places just do a curosory visual to see if you have cats. If one wants to be a dick and fail you for having long or mid-length headers and a catted Y, go to someone who doesn't. As long as the computer on OBD-II (post 1996) cars say your emissions are okay, you're good. Most will not, however, pass you if you go with an ORY (no cats at all).

  6. #6
    Member 89LX's Avatar
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    Navy
    2000 Z28 M6

    Great information and supports what I have been hearing. Thanks

  7. #7
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    Black
    2000 Camaro SS

    Why don't you install a true dual exhausts system all the way out the back and forget that stupid "Y" pipe?

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