Turbosmart Smart Port Blow Off Valve | Mitsubishi Lancer Evolution 8/9/X (TS-0215-1022)Smart Port Blow Off Valve The Smart Port takes everything enthusiasts love about the Dual Port BOV the classic vent to atmosphere sound in an ECU friendly, direct fit factory replacement BOV and makes it even better. Turbosmarts Smart Port technology means the BOV can remain closed at idle with a softer spring, improving valve response time and further reducing compressor surge, especially at low RPMs. This means the valve has the response and ECU