Product Details

HKS Hipermax S coilovers for the 2002-2007 Subaru WRX STI (GDB) are engineered for drivers who want genuine performance gains without giving up daily-driver comfort. Built around HKS's FLAT RIDE CONCEPT, the Hipermax S smooths out low-speed harshness while keeping the Subaru WRX STI planted under hard cornering — delivering the refined, controlled ride quality that makes a coilover worth owning on the street.

30-level damping adjustment, a large-diameter monotube damper, Dual PVS, and DURA BOOTS give the Hipermax S its signature mix of long-life durability and tunability. Length-adjustable shock bodies let you lower the Subaru WRX STI without pre-loading the spring, and every kit is backed by HKS's class-leading 3-year / 60,000 km warranty — validated over 60,000 km of real-world testing before it ever leaves Japan.

Features

• Monotube damper construction — separates gas/oil for stable damping under heat
• 30-level damping adjustment via the WR Needle valve system
• FLAT RIDE CONCEPT tuning — absorbs low-speed road harshness, controls body roll
• Dual Preload Valve System (Dual PVS) — tuned per chassis
• DURA BOOTS — new-spec dust boots with improved heat, weather, and ozone resistance
• Advanced Bump Rubber Plus — progressive, early engagement
• Reinforced rubber upper mounts (pillowball optional on select SKUs)
• HKS in-house cold-formed springs with printed spring rates
• PNE corrosion coating on threaded surfaces
• Length-adjustable shock body — preload-independent height adjustment
• 3-year / 60,000 km warranty (validated through real-world driving)
• Rebuildable — dust boots and stabilizer links now covered
• Made in Japan

Specifications

Vehicle Fitment

• 2002 Subaru WRX STI (GDB)
• 2003 Subaru WRX STI (GDB)
• 2004 Subaru WRX STI (GDB)
• 2005 Subaru WRX STI (GDB)
• 2006 Subaru WRX STI (GDB)
• 2007 Subaru WRX STI (GDB)