Stronger, more durable, adjustable and capable of withstanding much higher boost levels than the factory item, the new Skyline Dual Port is an ideal bolt-on performance replacement for anyone intending to increase the boost on their Nissan Skyline. Application Suits Nissan Skyline GT-S and GT-R (excluding R32 GTS-t) R32, R33, R34 and R35. Key Features Incudes both atmospheric and bypass ports Easily converts to a fully atmo or fully bypass valve Simple installation and set up. Sequential ports provide a quiet operation on mild boost and full performance at full boost Like all Turbosmart BOVs, the Skyline Dual Port is manufactured in Sydney, Australia under strict quality control. Featuring both the recirculating and vent-to-atmosphere ports, the Dual Ports offers the best of both worlds with quiet operation during normal driving and full flow benefits of an atmospheric BOV under full throttle.