HKS Hipermax S Coilovers - Mazda RX-7 (FD3S)

The HKS HIPERMAX S is a full coilover kit for the Mazda RX-7 (FD3S), built on a monotube design with 30-step adjustable damping front and rear and independent ride-height adjustment. It uses HKS's Dual PVS (Preload Valve System) to control damping at higher piston speeds for improved ride comfort without sacrificing handling. Front spring rate is 10 kgf/mm and rear is 11 kgf/mm.

Specifications

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