These replacement blow of valve springs are specifically designed to fit inside the Aeroflow Performance 50mm blow off valves. Both of our Aeroflow Performance blow off valves feature a 11psi spring from out of the box. If you wish to change this spring, we offer either a softer 6 psi for turbo setups or a 2 psi spring designed for supercharger options.

• AF59-2150 Green/2psi (.13BAR)Supercharger Only Spring
• AF59-2152 Black 6psi (.40BAR) Turbocharger Spring (-8 to -12 in/Hg)
• AF59-2153 Yellow 6psi (.75BAR) Turbocharger Spring (-18 to -20 in/Hg)

Part number: AF59-2152