All new GSC Power-Division Beehive Spring Kit with Titanium Retainers for the Subaru BRZ and Scion FRS. The 5056 Spring kit uses Chromoly spring seats to locate the ovate wire beehive spring and utilizes lightweight, precision Titanium retainers. This is absolutely the most lightweight, strongest spring kit for the FA20 platform. Capable of 35 PSI of Boost at 9,500 RPM, it’s a must have for high boost, high RPM builds.