Coilover Kit - HKS Hipermax R - GT86 & BRZHKS Hipermax R coilover kit for GT86 & BRZ HKS's Hipermax R coilover kit is designed for use on circuit and fast road track driving. Careful optimising of spring and damper rates provides a ride that's not too stiff for road, yet provides good stability and performance on track.. Features: Single Tube Damper Design Inverted mono tube dampers allow for more accurate and stable control and adjustment of dampening. Lower ride height and centre of gravity