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Gt55 turbo exhaust Size question.

Discussion in 'Turbo Tech Questions' started by Rcfreak24, Jan 9, 2022.

  1. Rcfreak24

    Joined:
    Jan 9, 2022
    Changing to single turbo gt55 and instead of running a 5" down pipe, the car has existing dual exhaust. Would the exhaust flow less if I made a Y pipe from 5" to dual 3"? In order to retain existing exhaust on the car out the back. Rather not run a 5" fender exit.

    Has anyone made a 5" Y to two 3"? If so any pictures?
     
    Rcfreak24, Jan 9, 2022
    #1

  2. B E N

    Joined:
    Nov 22, 2016
    Just use area of circle
    dual 3" = 2 (π 1.5) =14.14
    Single 5 = π 2.5=19.63

    So not equivalent, 3.5" gets you pretty close. Just run the 5" back however far you can, the gasses will cool and contract requiring less tubing size.
     
    B E N, Jan 9, 2022
    #2
    turbostang500 likes this.

  3. 87turbonotch

    Joined:
    Nov 11, 2003
    87turbonotch, Jan 12, 2022
    #3
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