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Exhaust pipe sizing

This is a discussion on Exhaust pipe sizing within the External Engine forums, part of the LSx Technical Help Section category; How large do you need to go in order to let the engine breath freely? I am building dual pipes. ...

  1. #1
    Junior Member
    Join Date
    Apr 2011
    Corvette C5

    Exhaust pipe sizing

    How large do you need to go in order to let the engine breath freely?

    I am building dual pipes.

    Engine is 2001 LS1.

  2. #2
    Moderator 98TransAmWs-6's Avatar
    Join Date
    Apr 2010
    Fairfax, VA

    Black/ Silver
    98 TA WS6/ 01 C5 Corvette

    3" should be fine.
    1998 Trans Am WS6 - Phantom
    421 CI LQ9, Tick Performance Custom Cam, TFS 255cc LS3 heads, Kooks 2" LT headers, Kooks 3" True Duals w/ high flow cats, FTP 104 lid, Speed Density Tune, 4" silicon tube, LS6 VCT, FAST 102 Intake, NW 102 TB, Oil Catch Can, SLP Bilstein Shocks w/ Vogtland Springs, CTS-V 4-piston Calipers w/C6 Z06 rotors, Stainless Steel Brake Lines, R1 concepts premium rotors, Hawk HP+ brake pads, VFN WSQ Hood, C5-R timing chain, SLP oil pump, E85 tune, Walbro 450 fuel pump, Deatschwerkz 95# injectors, Breathless performance headlights, Frost Tune, !HVAC.
    (Coming Soon) BMR DSL, UMI TQ Arm
    421 LQ9 14.8:1 on E85 Build/

  3. #3
    Member Redrokit8's Avatar
    Join Date
    Aug 2011
    Roseland NJ

    Pewter Silver
    2002 Trans AM WS6

    Quote Originally Posted by 98TransAmWs-6 View Post
    3" should be fine.
    I agree. The 3" will work out better as you add more mods to your engine. Especially if you have plans for LTH's.
    Magnaflow Quad Tip, Lid, SBellow
    UMI: FTC, FSB, RSB, LCA's, PBAR, SFC's, T-Arm w/relo, D/S Loop
    Kooks LTH, 3" YP, H/F Cats
    Custom Grind Cam, Stall, 3:73 rear
    Bilsteins w/Strano Springs Conti Super Contacts
    TuneByFrost MSD Wires
    Cross Drilled/Slotted Rotors w/Ceramic

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