There are no springs

the BoostGate50 focuses on charge air control by managing the compressed air on the cold side of the turbocharger system

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

38mm  / 1

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