Posté: Lun 19 Avr 2010, 21:48
Il existe aussi cette solution (aditionnelle) que j'avais vue en magasin lors d'un voyage aux US mais a pres de 950 usd 
, cela fait reflechir surtout que les gains annonces ci dessous me semblent "fantaisistes"...Bref pour plus d'infos, taper "Cayenne plenum" sur google....Il s'agirait de la positionner a la place du collecteur en plastique des deux filtres a air, apparemment il y aurait un meilleur flux mais bon si j'avais un tour numerique et Engineman 
a cote de moi, je le ferais vraisemblablement pour 45 euros.!!!! 
ci dessous la pub en Anglais
A+. Fred
IPD Intake Plenum Porsche Cayenne Turbo 955 03-07
The IPD Plenums are a unique design that dramatically increases horsepower and torque by optimizing air flow efficiency. Air flow is managed through a diversion splitter that maximizes air speed into the engine. The charged intake air maintains a higher velocity by replacing the factory plastic "T" intake with a stronger and more efficient cast aluminum "Y" design. This unique "Y" style plenum optimizes flow, improving acceleration and boost response. The new IPD replacement plenum eliminates the turbulent air flow by smoothly splitting and diverting the air flow and directing it towards the cylinders at a much higher air speed. This simple bolt-on plenum upgrade provides dyno proven increases in both power and torque throughout the entire rev range.
HP Gains: 32. Torque Gains: 25
, cela fait reflechir surtout que les gains annonces ci dessous me semblent "fantaisistes"...Bref pour plus d'infos, taper "Cayenne plenum" sur google....Il s'agirait de la positionner a la place du collecteur en plastique des deux filtres a air, apparemment il y aurait un meilleur flux mais bon si j'avais un tour numerique et Engineman a cote de moi, je le ferais vraisemblablement pour 45 euros.!!!! ci dessous la pub en Anglais
A+. Fred
IPD Intake Plenum Porsche Cayenne Turbo 955 03-07
The IPD Plenums are a unique design that dramatically increases horsepower and torque by optimizing air flow efficiency. Air flow is managed through a diversion splitter that maximizes air speed into the engine. The charged intake air maintains a higher velocity by replacing the factory plastic "T" intake with a stronger and more efficient cast aluminum "Y" design. This unique "Y" style plenum optimizes flow, improving acceleration and boost response. The new IPD replacement plenum eliminates the turbulent air flow by smoothly splitting and diverting the air flow and directing it towards the cylinders at a much higher air speed. This simple bolt-on plenum upgrade provides dyno proven increases in both power and torque throughout the entire rev range.
HP Gains: 32. Torque Gains: 25