1. PUTTING A MARINER 2.5 EFI THROUGH BREATHING EXERCISES

    By John Tiger
    Hot Boat - September 1999

    The Mercury/Mariner 2.5 260-hp EFI is a popular outboard. Witness that any time hot-boaters gather, the 2.5 EFI is easily the engine of choice. But what about making it "meaner"? Today the chinning bar has been raised, first by aftermarket hopup shops and then by Mercury Racing (by introducing this year's upgraded and updated 280-hp version). As hot as the original 2.5 was, owners of this potent 260-horse outboard have been looking for more power ever since its introduction in 1992.

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