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  1. #1
    mmo jo

    Anybody run dry exh.on hp 500 efi.

    whould you pick up any mph.or hp.

  2. #2
    Word of advice, do not run dry exhaust on your hp500efi, power gain about zero , fire potential from dry pipes up significantly

  3. #3
    speel chekk this fokker! Charter Member puder's Avatar
    My Boats:
    27' Scarab
    Join Date
    Feb 2001
    Locust Valley, New York
    i ran fully dry pipes on my 454 and it sounded good. EXCEPT nobody wanted to go on myboat anymore because it was so loud you got aheadache within 15 minutes at idle. I myself found it too loud. Water is being introduced on the new custom tailpipes...
    Pardon me, while I whip this out!

  4. #4
    Registered Sea Ya's Avatar
    My Boats:
    Fast boats, Harleys
    Join Date
    Apr 2001
    Charleston, WV

    Dry exhaust

    Changed to Gil Big Guns on
    502 efi's. 72mph to 80mph
    after going to 30p props.
    Louder from behind, about the
    same from the helm. 33'

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