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  1. #1

    Default Exhaust pipe size

    Does anyone know the pipe size for a 2003 silverado 5.3L I messured it already and got around 8 inches for the circumference (2.5 in diameter) just wanted to double check with someone before I get my 10 series
    2003 Chevy Silverado Z71 V8 5.3L
    S&B Cold Air Intake
    Weld Typhoon's
    Leveled with Edelbrock Shocks
    Flowmaster 10 Series
    Tuned with Diablo Predator

    GO USAF

  2. #2

    Default

    I believe it is 3" back to the muffler and 2.5" on the down stream side.
    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

  3. #3

    Default

    I remeasured and got around 3in for the inlet and 2.5 for the outlet thanks for the help
    2003 Chevy Silverado Z71 V8 5.3L
    S&B Cold Air Intake
    Weld Typhoon's
    Leveled with Edelbrock Shocks
    Flowmaster 10 Series
    Tuned with Diablo Predator

    GO USAF

  4. #4
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    Default

    If you want to find the diameter of your pipe & all you have is the circumfrence measurement, the formula is: (Diameter = .31831 x the circumfrence)
    Using your cirf. measurement of 8"...---> .31831 x 8" = 2.54648" This will work for any circle where you are able to measure the circumfrence but not the diameter.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  5. #5

    Default

    Quote Originally Posted by stephan View Post
    If you want to find the diameter of your pipe & all you have is the circumfrence measurement, the formula is: (Diameter = .31831 x the circumfrence)
    Using your cirf. measurement of 8"...---> .31831 x 8" = 2.54648" This will work for any circle where you are able to measure the circumfrence but not the diameter.
    Sounds like someone is a math teacher!! haha no that is a really good equation! I knew there was a way to find the diameter from circumference but forgot how haha. Thanks stephan!

    2006 Duramax LBZ
    Edge Evo
    4'' Diamond eye to 6'' tip
    16'' ion alloy, 33'' fierce attitudes
    Lots of work left to do!

  6. #6
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    Nope, not a math teacher, just school of hard knocks. If I had paid attention in school I would have learned it there, but unfortunately have had to learn it along the way instead, because I was such a stupid azz & mostly just f..off in school ha ha..

    BTW the other answer to this question was "cut the pipe in half and measure it"" ha ha ha

    I have other equations if you need them... just shout out
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


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