AVO Turboworld Blow Off Valve is the perfect addition to AVO's turbo kit for the FR-S. Created precisely with a lightweight brass piston design that is ideal for boost control with either front mount intercooler setups or top mount intercooler setups. AVO engineered their BOV to respond better to throttle lifts and bigger boost levels. The lightweight piston will ensure accurate boost control and venting under the harshest conditions. The Blow Off Valve AVO has designed comes with a removable plate that allows a percentage of the boost pressure to vent into the atmosphere while still circulating most of the pressure into the system to keep a smooth idle.