A direct fit replacement for the factory unit, the Turbosmart SmartPort BOV suits Mitsubishi EVO IV up to X. It can handle anything from stock to heavily modified vehicles with upgraded turbochargers. 

Benefits include
Direct fit upgrade for the factory BOV on EVO IV to X 
Staged dual ports allow for bypass and vent-to-atmosphere operation in one valve 
Smart Port trumpet eliminates stalling and allows smooth integration with the car’s factory engine mapping 
A Milspec, lightweight, aluminium piston providing excellent valve response and prolonged piston life 
All billet CNC construction and attractive anodized finish 
Manufactured, assembled and validated in-house at Turbosmart HQ 

Smart Port Technology 
The Smart Port is an innovative Blow Off Valve combining advanced design with precision CNC machined billet components. The valve works using two staged ports and a one-way valve on the trumpet outlet. This enables the Smart Port BOV to work like a bypass and vent-to-atmosphere valve in one while also eliminating stalling and significantly reducing the chances of low-speed compressor surge. In addition, the Smart Port’s unique lightweight piston is made from aerospace alloy with a military-spec coating, resulting in quicker valve response, better sealing and superior durability.