There are no springs

Strut: Strut lower fixing diameter has to be 56 mm or 62 mm

38mm  / 1

it is 50% lighter and 25% smaller than the competition while flowing 330 CFM – making it the highest flowing BOV of it’s type on the market

never exceeds the manufacturers tolerances - This will provide you rock solid oil supply pressure

BOV ProPort GenV Supercharger Black Touch Up Paint There are no springsProPort by Turbosmart is an All New 54mm (2. 13in) Blow Off Valve with a tiny footprint and massive flow. The ProPort flows 420 cfm which is enough for 3500 HP and is in a league of its own standing 30mm (1. 2in) lower than PowerPort while flowing over 25% more than the Market leading 50mm Raceport. Features include our unique locking collar design, new unique vent profile, sensor cap option and spring options for all turbocharged and supercharged