HKS Hipermax S Front Pillow Ball Coilover Full Kit - Subaru WRX STI (VAB) / WRX S4 (VAG) 2014-2021

This version of the Hipermax S replaces the rubber front upper mounts with pillow-ball units, giving a direct steering feel and repeatable camber location under load while the reinforced rubber rear mounts stay in place. The damper is a monotube design with 30 steps of damping force adjustment at every corner, inverted at the front and upright at the rear. Spring rates are 9.0 kgf/mm front and 7.0 kgf/mm rear with helper springs, and full-length shock body adjustment covers stock ride height down to 31 mm lower in front and 62 mm lower at the rear. HKS Dual PVS valving, the WR Needle soft-range circuit, Advanced Bump Rubber and PNE corrosion-resistant plating are standard.

Specifications

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy