The Turbosmart Kompact Plumb Back 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 Plumb Back BOV is designed as a direct bolt-on replacement of the factory valve system. The kompact Plumb Back BOV recirculates all excess pressure back into the intake system. The stock blow-off valve is prone to leak under high power applications due to its plastic design. The Turbosmart kompact Plumb Back is constructed from aircraft grade aluminium alloy ensuring no cracking or leaking even under increased boost levels. These Turbosmart BOV’s are great for enthusiasts not wanting to be noticed but wanting the performance and reliability benefits of a quality BOV.