TIAL TiAL Sport Blow Off Valve for BMW N54 – Q 50mm BOV Black – 10 PSI Spring Q.10B £285.00 Black TiAL Sport Blow Off Valve (Q 50mm BOV – 10 PSI Spring – External Vented) Q.10 10psi Spring – We include the BOV, v-band clamp, TiAL air fitting & high... Add to Cart