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  1. #1
    Platinum Member Platinum Member ApachePete's Avatar
    Join Date
    Aug 2001
    Sarasota,FL & Saugatuck, MI

    Convert HP500efi to 525

    Would it be easy to do?

  2. #2
    Registered User BAJA WILL's Avatar
    My Boats:
    Don't even mention the word boat
    Join Date
    Feb 2001
    Tampa, Indian Shores Beach
    It would be pretty hard to my understanding, they have different eletrical systems and some other stuff

    As for upping a 500efi to a 525 HP Arizona Speed Marine makes a kit for it, But I have heard it was not worth it, no noticable gain??

  3. #3
    Registered Whipple Charged's Avatar
    My Boats:
    Engine, speed, powerboats, Outerlimits SV43 with Whipple 1375SCI's
    Join Date
    Oct 2000
    Fresno, CA, 93722, USA
    I wouldn't see any reason to do so, totally different ignition, new exhaust, new heads, closed cooling, etc for 25hp? Recal the ECU and put a bigger throttle body for 20hp, it's a very little difference so might as well do it cheaper. You could even supercharge it for cheaper than converting, just run 1lb and you'll make 540-550hp


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