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1998 Cayenne GTS 6speed
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Air box is just that - a vessel to keep some volume of air close to the intake; it is there to reduce lag/bogging in situations when you sharply open the throttle from closed or nearly-closed position; it does not "increase torque" overall.

The protruding "appendices" on the intake are there to muffle intake sound and/or diffuse resonances (self-induced oscillations) in the air flow.
 
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