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Intake tuning and ram effect are widely known methods to increase engine performance. This paper details the design, manufacturing and results of an intake system with active duct length variation for a CBR600RR 2008 engine, equipped with a restrictor downstream of throttle body, in accordance due to Formula SAE competition rules. The engine was discretized in Gamma Technologies' GT-Power software bundle, and with the aid of the computational tool Design of Experiments (DoE), the lengths and diameters of the inlet ducts and beyond the plenum volume were determined in order to increase the engine torque in the range of 6000 to 12000 RPM. After the dimensioning process, the assembly was modeled in CAD, analyzing the packaging requirements determined by the regulation and a better adaptation of the system to the prototype, and then fabricated, including the plenum, restrictor and intake manifold.