the spring is designed to open under vacuum conditions to allow for the air to bypass into the exhaust manifold

The Supercharger-Specific PorPort features a softer ((4 In Hg) spring so it can stay open at idle when the supercharger is still producsing boost

Also Available in Dual Stage Boost Controller & In Cabin Boost Controller

This Improved 'working ratio' is achieved through an increase to the effective surface area of the diaphragm & revisions to the actual springs fitted resulting in greater leverage of the forces the actuator is working against (boost and backpressure) while still being super-responsive

who are also well known for their motorcycles

VW Golf/Jetta MK2/3 Vento (83-99) RN 5/2.5kg.mm Ukendt the spring is designed toNo Top Mount No Top Mount 5 2. 5kg. mm