To ease installation a 360 degree adjustable vacuum hose connector With a choice of inlet and outlet connections the RS valve can be matched to your engine perfectly This valve incorporates a unique conical, progressive rate spring that can allow for the retention of boost pressure from 7 to 34 PSI depending on the individual user's application and level of adjustment. This unique spring design will also allow for unrestricted piston travel and flow volume regardless of the amount of pre-load adjustment added to the spring. Other manufacturers valves using cylindrical springs with adjustable pre-load often experience restricted piston travel and flow volume within the normal range of valve adjustment.
Fits evo 4/5/6/7/8/9
Comes in polished silver or black, please specify.
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