GReddy BOV Replacement Diaphragm Type RZ Universal Scion No pressure relief

Scion No pressure relief

Also since you are using this flange kit to vent the BOV to atmosphere

The part is specially designed for an ultra high amount of oil flow to prevent a backup

With Z32 Airflow Meters

Alternate options include a 2" or 1

GReddy BOV Replacement Diaphragm Type RZ Universal Scion No pressure reliefGReddy Blow Off Valves are easily adjustable to eliminate compressor surge and preventing premature boost leakage, while increasing boost response between shifts. Each valve is made of durable cast and billet aluminum frame and the valve to diaphragm ratio provides performance that cheap piston types cannot offer. The spring stiffness adjustment screw and the three different models give the GReddy user the option to match vehicles with mild upgrades