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Convert HP500efi to 525

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Old 03-18-2003, 05:50 PM
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Default Convert HP500efi to 525

Would it be easy to do?
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Old 03-18-2003, 06:38 PM
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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??
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Old 03-18-2003, 08:51 PM
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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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