Interchangeable setup springs for the BOV50c blow-off valve from Nuke Performance, available in six different versions, ideal for all boosts. Ideal for any level of boost, thanks to its adaptability with a diverse selection of interchangeable setup springs, catering to your specific requirements. The Nuke Performance Blow Off Valve BOV50c V-Band offers unparalleled flexibility with a selection of six interchangeable setup springs, ideal for all bosts. The BOV50c has a "blue" spring preinstalled, and the swap for another spring is very easy thanks to the three-bolt design. * The BOV50c is equipped with a pre-installed Blue Spring.** Used for supercharger applications only Select the BOV spring pressure rating based on your engine´s vacuum reading at idle when the engine is at ideal operating temperature. Boost is unrelated to spring pressures; it is solely associated with vacuum. The lowest rate spring (Light Gray) is specifically designed for superchargers and is not intended for use with turbochargers. These springs only work with BOV50c from Nuke Performance, the first-generation BOV50 blow-off valves use another series of springs. Quantity : 1pc BOV50c Spring Pressure Chart Measure the engine vacuum at idle and with the engine at operating temperature. Superchargers Only Light Gray Spring # 9200-01-016 ** -0.27 to -0.39 BAR (-8 to -11 in Hg) Green Spring # 9200-01-017 -0.40 to -0.52 BAR (-12 to -15 in Hg) Magenta Spring # 9200-01-018 -0.53 to -0.65 BAR (-16 to -19 in Hg) Blue Spring # 9200-01-019 * -0.66 to -0.75 BAR (-20 to -21 in Hg) Red Spring # 9200-01-020 -0.73 to -0.79 BAR (-22 to -23 in Hg) Black Spring # 9200-01-021 * the BOV50c is delivered with a preinstalled blue spring** used for supercharger applications only Select the BOV spring pressure rating based on your engine´s vacuum reading at idle when the engine is at operating temperature. Boost is unrelated to spring pressure; it is solely associated with vacuum.