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  1. #1

    Default Y-Pipe: Needed or Recommended?

    Is a Y-Pipe needed or just recommended when installing long tube headers? Looking at buying PaceSetter LTs and was wondering if getting a Y-Pipe is a necessity for easier installation (possibly better performance also) or just a recommendation for making it an easier installation?
    2003 Silverado 2500HD 6.0L Vortec V8
    2" Body Lift
    3" Suspension Lift
    Skyjacker Hydro 7000 Shocks
    Skyjacker Steering Stabilizer
    35" Tires with 20" American Racing Rims
    Velocity Cold Air Intake
    Billet Throttle Body Spacer
    BBK Performance Headers
    MBRP Cat-Back Exhaust System
    DiabloSport Predator- Soon to be tuned by Diablew

    "Soon to be leveling-kit"

  2. #2
    Master Mechanic Big75's Avatar
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    Seward, Nebraska, United States
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    If you want to run one pipe out the back or side, you need a Y pipe. If you want to go dual exhaust, it's a good suggestion to run an X pipe somewhere along the line. Sounds cleaner and helps you keep your low end torque. you can run duals without an X pipe though, wont hurt anything.
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  3. #3


    Doe's the Y-pipe replace the cats and let you bolt-up the headers to the exhaust?

  4. #4
    Master Mechanic Big75's Avatar
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    Seward, Nebraska, United States
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    You're going to have some fabrication using long tube headers no matter what you do. shorties should be a direct replacement for stock manifolds. If you want to keep the rest of the exhaust stock, you will at the least need to get a set of header collectors. You can get those with a section of pipe pre-flanged.

  5. #5


    I was planning on going the one pipe route since I already have the MBRP cat-back exhaust and I wasn't sure if the Y-Pipe was needed. So will the LTs connect directly to the Y-Pipe and the Y-Pipe connect to the exhaust? Or is this where you need the header collectors you were talking about?

  6. #6
    Sr. Engineer FergusonT's Avatar
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    May 2010
    Southwest Michigan


    I would go with the O pipe
    1999 Chevrolet Suburban LS K1500
    1991 Chevrolet S10 4.3L 4x4
    2005 Suzuki Forenza (GM/Daewoo)

  7. #7


    I have no Y pipe on my 2002. 2 headers, two separate pipes the whole way. I love the sound of it without an X/H/Y pipe. I also have no cats on my truck either so that makes it even better!
    2002 Chevrolet Silverado 1500 z71 1985 Chevrolet Silverado k10 2006 Chevrolet Silverado 2500hd 6.6l LLY Duramax
    6.5" BDS Suspension Lift Edelbrock Carb & Polished Intake Manifold & Valve Covers NAPC Race Transmission & NAPC Built Transfer Case
    EFI Live Comp Cam and Valvetrain Snow Performance Methanol Injection
    35" Toyo Open Country Mud Terrain on 18" Ion Alloy 179's Headman Long Tube Headers and True Dual Exhaust FASS 150gph Titanium Series Pump
    AirAid Cold Air Intake with K&N Dry Filter & AirAid PowerAid Throttle Body Spacer 2" Suspension Lift 33x12.50r15 Tires EFI Live & AFE Stage 2 Intake
    Pacesetter Long Tube Headers with Cats Gone True Dual Exhaust FlowPro 3.73 Gears Yukon Grizzly Locker with Mag-Hytec Cover & Traction Bars
    NGK Iridium Tips & MSD Ignition Plug Wires Baja Spare Tire Holder 33x13.5 Hankook rt03 18" XD Rims
    Innovate LC-1 Wideband o2 Sensor x2 HID's all around LED taillights and 3rd brake light
    BDS Dual Steering Stabilizers Pioneer Double-DIN Touchscreen Navigation with Two 10" Subs under rear seat
    Electric Fan Autometer Pressure, Boost, and Pyro Gauges
    4.56 Gears Airlift Air Bag Suspension

  8. #8


    I am in PA and it is required by law to have cats and I don't know anyone who can just hollow it out. So I would have to either scrap my existing exhaust or do a custom true duals or buy another one to make true duals with the MBRP exhaust..

  9. #9


    I have talked to the guys at Summit about this same issue and if you go with the LTs and you want to keep your exhaust then you are going to need the Y pipe. I am not sure if it is flanged or not. But Summit has really good Tech support if you go to the site.

    I have the same setup as ippielb on my '02 Chevy,except my cats aren't hollowed out, and i have to say i miss that sound on my '10 GMC.
    2002 Chevy 1500 Ex-cab Z71: 5.3L, auto 4, shorties, hi-flow cats, true dual 2.5" straight pipes, AirAid intake, TBS, Platinum plugs, 8.5mm wires, programmer, 3in w/ 33s, also has the composite bed

    2010 GMC 1500 Crew Cab Z71 w/ All Terrain package: 5.3L, auto 6, 2" Zone leveling kit, AirAid Jr. Intake Kit

  10. #10


    H-Pipes give you a nice sound with the benefit of pressure equalization. X has better equalization but you lose some of the sound quality. True duals are nice but only if you don't have much restriction following the headers (ie no cats and race mufflers)

    Y-pipes are needed sometimes just for space consideration, where you only have room for 1 pipe going to the back.
    1986 Chevy G20 Tow Rig - 5.7 TBI conversion
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