Intake Air Plenum: Description and Operation

2474 - Tuning Flap

As with the engines in the previous Boxster (986), model year 2004, the resonance intake system on the new engines is again designed with a switchable tuning flap in the perpendicular resonance pipe between the intake distributors. This resonance intake system can be used to adjust the air oscillations in the intake system to the respective engine speeds to ensure high torques even at low rpms, an even torque curve and high maximum output. The tuning flap is closed in the low rpm range.

Boxster (987) - The tuning flap is closed at full throttle between 5000 and 7200 rpm.

Boxster S (987) - The tuning flap is closed at full throttle between 4700 and 7200 rpm