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The O-ring groove and head stud combination significantly improves head gasket sealing under elevated cylinder pressure -- a common failure on the FA20 DIT at high boost
they can become brittle and come apart
reduces drag
KICS BULLOCKS 12X1
Direct fit and pre-set adjustment
HKS Cup Hipermax R Coilover Full Kit - 2022-2026 Subaru BRZ / Toyota GR86 Toyota-GR-Corolla-2025 The O-ring groove and headHKS Cup Hipermax R Coilover Full Kit 2022 2026 Subaru BRZ Toyota GR86 HKS Hipermax Suspension Engineering The HKS Hipermax line is the product of decades of suspension development through motorsport application and real world testing. Each kit is designed for a specific platform, with spring rates, damping curves, and upper mount geometry validated through HKS's own testing program. The Dual Preload Valve System (Dual PVS) suppresses unnecessary