The biggest open blow off valve - available in various colours TiAL Q BOV black - aluminium flange The new 50mm Blow Off Valve von TiAL Colors: black, silver, purple, blue, red (please ask for availbility. Without information we ship black) flange: Aluminium or stainless steel (Without information, we ship aluminium) The biggest open blow off valve. With 50mm flow it is able to let out enough air on high boostet turbosystems. Not recommended for new enigines with MAF! All our TiAL products are original and are with valid serial numbers graved! Please take car on cheap fake copies! Note: TiAL offers the Blow Off Valves with different springs. In order to keep delivery times short, we cannot supply all variants from stock and cannot offer free spring replacement at our premises. Please understand that we only deliver the BOV/s with the 0,48 bar spring. If you want a different spring pressure, please order the appropriate spring separately.