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In this paper the fluid dynamic behaviour of a high-performance airbox for a naturally aspirated off shore race engine is analysed by varying its geometrical configuration. In fact, since the introduction by the Union International Motonautique of more restricting rules and boat shape constraints, the design of off-shore engines airboxes has become particularly challenging especially for the introduction of an air restrictor near the inlet to limit the maximum engine power. Accordingly, to optimize the time-to-race, the work has been developed using a numerical approach with the following objectives: - the maximum as possible reduction of the fluid dynamic losses; - an uniform distribution of the mass flow rate among the 12 cylinders (a typical off-shore engine subdivision).