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2003 5.0l Mercruiser MPI Upgrades

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Ok i'm looking for some advice for all the gear heads out there. This past summer I upgraded our prop from a 3 blade aluminum to a 4 blade stainless and it make a great deal of difference in the hole shot. Does anyone have any experience with any engine upgrades to get some additional horsepower out of their 5.0l merc? I saw this Boost Chip online has anyone used these or heard of these helping?

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that thing is a gimmick.  The only real way to add hp is to do serious and costly upgrades to the engine like cam, supercharger, exhaust, etc.  And a Chaparral hull is not designed to be a high performance boat so it takes major hp increases to see what adds up to only small performance increase.


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