IPD Plenums 997.1 Carrera S 3.8L Porsche Tampa this 7 second race proven design this 7 second race proven design has been perfected and now available for your high horsepower R35 GT R our piece not only produced more HP and torque but it did so through the ENTIRE POWER BAND 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