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This is what our cars have.
"The Boxster S shares its twin-resonance air induction system with the 911
Carrera. The system acts as a “resonance supercharger,” allowing the engine to
draw from higher velocity airflow at certain engine speeds. A crossover pipe
connects the individual air collector/resonance chambers for each cylinder bank.
A flap in the pipe remains closed from idle to about 3,100 rpm. When it opens,
each cylinder bank can draw from airflow “excited” by the resonance created by
alternating induction between all six cylinders. In essence, “dual resonance”
creates two induction paths for each cylinder. Below 3,000 rpm, the cylinders
draw air from a “short” path. From 3,000 rpm to about 5,100 rpm – when the
resonance flap opens – the cylinders draw from a long intake path, which boosts
torque. Above 5,100 rpm, the flap again closes to allow the cylinders to draw
intake air from a shorter intake path to boost horsepower at higher engine speeds"
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Threaded Mode
