The intake manifold with double-flow distributor pipe has an adjustable flap that closes and opens at defined engine speeds. As a result of a two-stage resonance effect, the air mass in the intake manifold begins to oscillate, which in turn generates a turbocharging effect and optimises induction. These two effects combine to produce higher torque at low engine speeds, a flatter torque curve and increased power output at high engine speeds, while the acoustic properties of the system are second to none. A sound that is typically Porsche.