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  1. #1
    VIP Member Platinum Member wwwTOPDJcom's Avatar
    My Boats:
    1992 450hp Senza Spectre 25'
    Join Date
    Mar 2002
    Vestal/Binghamton NY

    Question underdrive pulleys?

    well I had them on my vette a few years ago and they seemed
    to help pick a some extra power , power chip and sidepipes helped too.
    But the real question does this give u any gain's in the Boating world???

  2. #2
    Charter Member # 55 Charter Member Griff's Avatar
    My Boats:
    ..........32........... Active Thunder
    Join Date
    Oct 2000
    Underdrive pulleys usually give you single digit hp gains on cars. I have them on my Saleen Mustang and can't tell any difference from when I didn't have them. Idon't think you would notice anything on a boat either. 5-9 hp translates into .2-.5 mph on the speedo, if that.

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