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GSC 4B11 Evo X Conical Valve Spring Kit (5062) BBS Pictured installed on Cory's 1999 Select::Grade 12 (12207 JF01B) Pictured installed on Cory's 1999 GSX with the STM atmosphere dump o2 housing (which is no longer available as of September 2023) The Injen SP Series cold air intake system for 2003 2006 350Z is made from smooth 6061 T6 aluminum intake tubing to eliminate restrictions and improve airflow a conical spring acts as a natural harmonic damper in the transfer of valvetrain shock True conical valve springs are not a new concept and are industry proven to provide several key advantages over traditional spring designs
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