Agency Power set out to engineer and design a plenum that was functional, did not require additional tuning, and simply... made power. The plenum is 6061 aluminum that retains the same shape as the factory T Pipe. The reason to keep a standard T shape is that the engine works off of pulses. The factory throttle body inlet size is 76mm that then jumps up to a 78mm ID plastic plenum. AP has chosen to use a 78mm Cayenne Turbo throttle body which bolts on and fits to the stock Y Pipe. The plenum now keeps a 78mm ID throughout the system. The T shape plenum features all the necessary vacuum and breather hose ports as stock for a true bolt on application. Each plenum features a CNC machined throttle body flange that includes the necessary recessed gasket for a sealed fit. The complete T plenum is TIG welded and then powdercoated gloss black inside and out for a smooth and stealth finish.

As tested on a 2001 Porsche 996 Turbo, this plenum achieved an impressive gain throughout the entire powerband with a peak gain of 20 whp and 20ft/lbs of torque. Based upon the dyno graph, the power increase began at the dyno test start of 2500 rpm and pulled all the way to the finish of 6500 rpm. This kit includes both the plenum and Porsche OEM throttle body to be used on all Porsche 996 Turbo, X50, or GT2 from 2001-2005.

Reverting back to old tuning technologies, Agency Power has developed a larger throttle body and plenum kit for the Porsche 997 Turbo to gain added performance. The point of a larger throttle body is to get in more air. The more air you bring in, the more power you make. The 997 Turbo's engine intake system works off pulses, so how that air is diverted to either side of the engine is not as important as the volume incoming. The plenum kit includes an OEM Porsche Cayenne Turbo throttle body (part# 94860511503) which is a direct bolt on and plug in for the electronic throttle control with no modifications needed. This throttle body has a 77.64mm inner diameter compared to the stock one of 75.64mm. We chose to go with this smaller diameter throttle body to give the car more low end horsepower and torque. If the diameter of the throttle body is to big, it will increase turbo lag and performance gains will only be made at the mid to top end RPM range.

The AP plenum kit is made using high quality 6061 aluminum that has been TIG welded and pressure tested in a T shape to mimic the OEM design. The CNC machined 4 bolt throttle body flange features a groove to accompany a rubber o-ring to ensure a secure and sealed fit with the OEM Porsche Cayenne throttle body. The T plenum features the necessary fittings for stock vacuum hoses and breather lines and includes a 1 way check valve needed. Each T plenum is powder coated gloss black for an OEM look and includes new silicone couplers in black and worm clamps to secure it to the factory intake manifolds.