HKS 80330-AF009P Hipermax S Coilovers 2015-2021 Subaru WRX/STI FA20 EJ20

Vehicle Fitment

• 2015-2021 Subaru WRX (VAG Platform, FA20 Turbo, AWD)
• 2015-2021 Subaru WRX STI (VAB Platform, EJ20 Turbo, AWD)

Fitment Notes

• WRX STI VAB fitment confirmed for 6MT (manual transmission) only
• WRX S4 VAG (JDM D-type automatic variant) shares the same part number - confirm vehicle spec before ordering
• Does not fit 2022+ WRX (VB chassis)

Features

• Dual Preload Valve System (Dual PVS) reduces unnecessary damping force at higher piston speeds for improved ride comfort
• Single-tube monotube damper design with separated gas and oil chambers for consistent, stable damping force
• 30-step damping force adjustment on both front and rear for street-to-track versatility
• Front pillow ball (spherical) upper mount delivers sharper, more direct steering response vs. rubber mount version
• Wide-range needle jet design expands damping adjustment range for broader driving stage compatibility
• Advanced bump stop rubber reduces body roll while maintaining compliance over large impacts
• PNE coating provides 5x better corrosion resistance vs. standard galvanizing
• 3-year manufacturer warranty - double the coverage of the previous Hipermax IV GT series

Specifications

• Spring Rate - Front: 88 N/mm (9 kgf/mm) | Rear: 69 N/mm (7 kgf/mm)
• Free Length - Front: 220 mm (Barrel) | Rear: 170 mm (Barrel)
• Damping Force at 0.1m/sec - Front: Rebound 809 N / Compression 505 N
• Damping Force at 0.1m/sec - Rear: Rebound 363 N / Compression 348 N
• Helper Spring Rate - Front: 4.7 N/mm | Rear: 4.7 N/mm
• Damping Adjustment - Front: 30 Steps | Rear: 30 Steps
• Default Damper Position - Front: Step 15 | Rear: Step 15
• Upper Mount - Front: Pillow Ball (Spherical) | Rear: Rubber Bush
• Damper Layout - Front: Inverted | Rear: Normal
• Ride Height Range (VAB STI) - Front: 0 to -31 mm | Rear: 0 to -59 mm
• Ride Height Range (VAG WRX) - Front: 0 to -37 mm | Rear: +1 to -62 mm
• Factory Spring Rate Change Available: ±10 N/mm (±1 kgf/mm) Front & Rear

Included Components

• 2x Front Inverted Coilover Assemblies (with pillow ball upper mount)
• 2x Rear Coilover Assemblies (with rubber upper mount)
• 4x Helper Springs
• 1x Spanner Wrench Set
• 1x Damper Adjustment Tool

Product Description

The HKS Hipermax S Coilovers (80330-AF009P) are the pillow ball variant of HKS's flagship street coilover series, purpose-built for the 2015-2021 Subaru WRX and WRX STI. The "P" designation means the front upper mount uses a spherical (pillow ball) bearing instead of a rubber bush, delivering sharper turn-in response and more direct steering feel - ideal for drivers who want a performance-forward setup without sacrificing daily usability. Ride height is independently adjustable at all four corners via the lower bracket, allowing a lowered stance without compromising the damper's full stroke range.

HKS engineered this series around the Dual Preload Valve System, which controls damping behavior at high piston speeds to reduce harshness over rough surfaces while keeping the suspension planted during spirited driving. The 30-step adjustment dial lets you dial in the exact feel you want - from a comfortable daily commute setting to a firmer, more responsive track-day tune. The inverted front strut design reduces unsprung weight and increases lateral rigidity, contributing to improved cornering stability under load.