IPD Plenums 991 DFI Carrera S 3.8 IPD Plenum RPS The beehive valve spring shape

The beehive valve spring shape has become the buzz lately

Slope Intercept matching as introduced by Injector Dynamics in 2007 solved this problem by matching injectors based on flow rate (Slope) and offset (Intercept) providing even cylinder to cylinder fueling across the linear operating range

This version of the 997

provide the needed stability

Dodson Promax Clutch/Alloy Version (13 / 13)

IPD Plenums 991 DFI Carrera S 3.8 IPD Plenum RPS The beehive valve spring shapeThe all new specifically designed IPD 3. 8L DFI Carrera intake Plenum is a direct bolt on upgrade that replaces the factory air intake distributor and utilizes all pre existing factory hardware and throttle body. The improved IPD intake design allows for smoother, less turbulent and more efficient air flow resulting in impressive power and torque gains for Porsche driving enthusiasts. The superior design of the DFI IPD Plenum provides an additional 15