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

The Hipermax S is a full-length adjustable coilover kit built on a monotube damper with 30 steps of damping force adjustment at every corner, using an inverted front strut and an upright rear damper on this chassis. HKS sets the full kit at 9.0 kgf/mm in front and 7.0 kgf/mm at the rear on barrel-wound front springs, with helper springs at all four corners. Shock body length adjustment covers stock ride height down to 41 mm lower in front and 62 mm lower at the rear, so corner balance is set independently of spring preload. Reinforced rubber upper mounts are fitted front and rear, and the kit carries HKS Dual PVS valving, the WR Needle soft-range damping circuit, Advanced Bump Rubber and PNE corrosion-resistant plating.

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