Tein Street Advance Z Coilover Kit Lexus GS300 2006, GS350 2007-11, GS430 2006-07, IS-F 2008-14, IS250/350 2006-13Tein Street Advance Z Coilover Kit Lexus GS300 2006, GS350 2007 11, GS430 2006 07, IS F 2008 14, IS250 350 2006 13 About the Sealed Structure The top end of the shell pipe is narrowed, oil and gas are injected, and the whole unit is sealed by crimping the metal. This new approach massively shortens the production process. As a result, we have succeeded in vastly cutting production cost. Thread Type Ride Height Adjustment The ride height can be