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Thread: 4.8l or 5.3l OEM cats....for swap.

  1. #1
    Join Date
    Feb 2011
    Location
    Mobile, al
    Posts
    156

    4.8l or 5.3l OEM cats....for swap.

    Wondering if anyone out there has removed their OEM cat. coverters for some aftermarket headers. I'm needing the y-pipe for my '97 OBS swap with a 4.8l. Let me know what you have. I'm located in Mobile, AL and can drive(within reasonable distance) to pick or meet.

    Jose

  2. #2
    Join Date
    Jan 2009
    Location
    Round Rock, Texas
    Posts
    1,704
    I've got the stock cats, but not the complete y-pipe. There is enough pipe left on them to fab up a new y-pipe. The stock flange are still connected to them aswell. Pictures in the for sale section
    cjriojas:if you're weather man is a 5 gallon bucket, YOUUUUUUUUUUU might be a redneck
    danger_ranger83: I see now why it cost so much to get a harness made... FML
    2boostedSilverado: I like Casey's rear end, I want to chat with him about it

  3. #3
    Join Date
    Jul 2008
    Location
    The Garage
    Posts
    1,333
    I have a stock Y-pipe assembly with cats from an '06 4.8L

    ~ Forged engine of some type ~ Ball bearing turbo of an unconfirmed size ~ 4L8000 trans ~ Beefy fuel system ~

  4. #4
    Join Date
    Sep 2008
    Location
    Arizona/Utah
    Posts
    3,955
    Why are you choosing to keep the cats?
    ECSB 2kSierra 2wd 4.8L-K&N-HPtuners-Calspeed LT's-Magnaflow-Tahoe20's-HankookRH06

    waiting to go in... 3.90s, 214/220cam

  5. #5
    Join Date
    Feb 2011
    Location
    Mobile, al
    Posts
    156
    No particular reason, I've found a set of ss headers for $320....I figured I could get the stock Y-pipe for less. This is a budget build....later,once I have some extra $, I may do the headers.

  6. #6
    Join Date
    Sep 2008
    Location
    Arizona/Utah
    Posts
    3,955
    A cheap route would be fabing a ypipe with no cats. Plus a nice boost in power. Or you can order one and adjust it slightly to fit just right. I think jegs makes off-road ypipes for you truck for around 150$ (goes off to find link)

  7. #7
    Join Date
    Jun 2011
    Location
    Dallas/Plano, Texas
    Posts
    193
    I have a stock y-pipe with cats from my 4.8l if you're still needing a set.

    If not enjoy the swap
    Derrick ; truck stolen

  8. #8
    Join Date
    Jan 2009
    Location
    Rockwall, TX
    Posts
    558
    or you could buy new longtubes for $250 and have an exhaust shop make a y for $80

    1989 RCSS 5.3/4L60E swap
    - 224/230 .581.591 112lsa,
    - 3200 Stall
    - DJM 4/6 drop
    - Nelson Tuned

    Building the truck GM never did..

  9. #9
    Join Date
    Feb 2011
    Location
    Mobile, al
    Posts
    156
    I was thinking of these:
    http://speed-daddy.com/index.php/hea...-4-8-5-3l.html

    Not sure if they'll fit. Really on the last part of this swap...I'd like to drive this by Christmas! AHAHAHAHA

  10. #10
    Join Date
    May 2009
    Location
    hot & windy
    Posts
    1,124
    i've got a stock y-pipe from my 99NBS in my for-sale thread, and i just live in pensacola
    00 FRC - just top end, exhaust, and a hot-air intake
    99 Sierra - 5.3 / 5spd
    ↓ click the pic for the build ↓

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