997.1 Carrera 3.8L Plenum: HP Gains 28 / Torque Gains 26 Utilizes factory 74mm TB
The 997 marked Porsche's return to the round headlights and curvaceous fenders reminiscent of the 993 and earlier era Carreras. Although the 997's picturesque styling is another milestone in Porsche design history there is still room for improvement in the engine performance department.
The IPD "Y" design plenum replaces the factory "T" style air distributor and provides substantial power and torque gains by means of a more efficient design. Horsepower gains range from 24 to 28 depending on engine displacement and engine condition. These max power gains are experienced in the mid range where is it most useable and enjoyed.
The IPD plenum not only delivers impressive power and torque increases but also creates a more linear power and torque band. Tiptronic customers even claim considerable improvements with more positive shifting after installing the IPD Plenums.
The 997S IPD Plenum provide power increases throughout the entire power band. Gains of 28 horsepower and 26 foot pounds of torque are experienced in the midrange with gains of 11 to 12 hp at the peak.
The "Y" design of the 3.8 liter IPD Plenum also allows for a more linear power delivery and improved throttle response that elevates the 997 S Carrera driving experience even higher.
Power improvements will be fully realized once the factory DME makes all the necessary “adaptation” requirements which occurs after a series of hard pulls on the dyno or full throttle runs (at your local race track of course).
The 997S IPD Plenum is a direct bolt on replacement and installation is relatively straight forward for mechanically inclined DIY customers although IPD strongly recommends all Plenum installations be performed by a trained and qualified Porsche technician.