Turbosmart Kompact dual-port blow-off valves offer high performance, OEM fitment, versatility, and affordability—in other words, everything you need! These BOVs feature dual ports that vent into both the atmosphere and the air intake, reducing turbo lag and eliminating cavitation. Turbosmart Kompact dual-port blow-off valves are designed to be bolt-on replacements for plastic factory Bosch or Denso units. They use sequential timing to allow for quieter operation during normal driving, while still providing the benefits of a vent-to-atmosphere type BOV under race conditions. They are easily converted into full atmospheric or full bypass units by using the included port blanking plug.