IPD Plenums provide a simple, yet highly effective way to gain extra horsepower and torque for improved acceleration. Featuring a new designed aluminum plenum which replaces the flat-walled stock plenum with a design that increases airflow and air speed (velocity) to the engine. Along with the power gains the IPD Plenum provides it also replaces the stock plastic Cayenne TT plenum which is prone to cracking. Dyno tests on a Cayenne TT revealed a 32 Horsepower increase and 25 ft lbs. torque at the rear wheels.