HKS 80330-AN005 Hipermax S Lowering Coilovers for 1998-2001 Nissan Skyline ER34

Vehicle Fitment

• 1998-2001 Nissan Skyline GT-T (ER34 Platform, RB25DET NEO 2.5L Inline-6 Turbo, RWD/4WD with HICAS)

Fitment Notes

• Fits ER34 production from May 1998 through June 2001
• Compatible with RB25DET (turbocharged) engine only - does not fit NA RB25DE variants
• Compatible with HICAS (4-wheel steering) equipped models
• Does not fit Nissan Skyline GT-R BNR34 (RB26DETT) - that model requires a separate HKS part number
• Upper mounts are rubber bush front and rear - this is not a pillow ball variant

Features

• Single-tube monotube damper with separated gas and oil chambers for stable, consistent damping force
• 30-step damping force adjustment on both front and rear for street-to-track tuning flexibility
• Dual Preload Valve System (Dual PVS) suppresses unnecessary high-speed damping force for improved ride comfort
• Inverted front strut design reduces unsprung weight and improves lateral rigidity under cornering loads
• Advanced bump stop rubber reduces body roll while maintaining compliance over large road impacts
• PNE coating delivers 5x corrosion resistance compared to standard galvanizing
• Wide-range needle jet expands the effective damping adjustment range across all 30 steps
• 3-year manufacturer warranty backed by HKS in-house durability testing and 60,000 km real-world validation

Specifications

• Spring Rate - Front: 78 N/mm (8 kgf/mm) | Rear: 59 N/mm (6 kgf/mm)
• Free Length - Front: 170 mm | Rear: 170 mm
• Damping Adjustment - Front: 30 Steps | Rear: 30 Steps
• Default Damper Position - Front: Step 15 | Rear: Step 15
• Upper Mount - Front: Rubber Bush | Rear: Rubber Bush
• Damper Layout - Front: Inverted | Rear: Normal
• Ride Height Range (vs. stock) - Front: 0 to -58 mm | Rear: 0 to -33 mm
• Default Ride Height at Shipment (vs. stock) - Front: -16 mm | Rear: -12 mm
• Factory Spring Rate Change: Not available for this application

Included Components

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

Product Description

The HKS Hipermax S Coilovers (80330-AN005) are purpose-built for the Nissan Skyline ER34 GT-T, engineered specifically for the RB25DET NEO turbocharged variant on the R34 platform. This is the rubber upper mount version of the Hipermax S - well-suited for drivers who want a meaningful improvement in handling precision and ride height adjustability over stock, while retaining good noise isolation for daily street use. The kit ships with a mild factory-default drop of approximately 16mm front and 12mm rear, making it immediately drivable out of the box without requiring alignment corrections before first use.

The Dual Preload Valve System and 30-step adjustment dials allow fine-tuning from a comfortable daily commute setting to a firmer, more responsive setup for mountain roads or track days. The inverted front monotube damper reduces unsprung weight for sharper response and better tire contact, while the 8 kgf/mm front and 6 kgf/mm rear spring rates are well-matched to the ER34's chassis balance. With up to 58mm of front drop and 33mm rear available within the drivable range, there is enough adjustment to achieve an aggressive street stance without compromising suspension travel.