The 997 marked Porsche's return to round headlights and the classic curves of the 993 and earlier Carrera models. While its iconic design is a highlight in Porsche's history, the 997's engine performance still has room for enhancement. The IPD "Y" design plenum replaces the factory "T" style air distributor, delivering notable gains in performance through its more efficient design. Drivers can expect improvements, especially in the mid-range, with a power increase of up to 28 depending on engine displacement and condition. Beyond performance gains, the IPD Plenum offers a smoother, more linear power band. Tiptronic drivers also report enhanced shifting response, providing a more connected and refined driving experience. --------------Our 997.1 Carrera Comp Plenum is available with 2 different silicone hose options. ----Part # 97182 includes the custom IPD silicone hose designed to fit the 82mm GT3 throttle body and factory Porsche air box. ----Part # 97182-RH includes a straight silicone reducer hose coupler that fits the 82mm GT3 throttle body and the popular after-market air intake systems that replace the factory air box. Requires upgraded 82mm Porsche TB (Additional purchase below). --------------Genuine "GT3" Porsche 82mm Throttle Body. | Part# TB0082 This is the larger, Genuine Bosch Porsche throttle body required to fit the larger 82mm “Competition” Plenum.