The Turbosmart Kompact Dual-Port BOV (blow off valve) for your Porsche 997 is a must-have modification to ensure your engine remains at its peak performance. The Porsche 997 Turbosmart Kompact Dual-Port BOV is designed as a direct bolt-on replacement of the factory valve system. The kompact shortie is a dual port BOV design which provides one plumb-back port to keep the car’s computer happy and a second vent to atmosphere port for that trademark turbosmart BOV sound we all love. The stock blow-off valve is prone to leak under high power applications due to its plastic design. The Turbosmart kompact dual=port is constructed from aircraft grade aluminium alloy ensuring no cracking or leaking even under increased boost levels. These Turbosmart BOV’s incorporate a sequential timing to allow for quiet operation during normal driving while getting all the benefits of a vent-to-atmosphere BOV under race conditions.