HKS 80330-AN010 Hipermax S Lowering Coilovers 2003-2009 Nissan 350Z G35 VQ35

Vehicle Fitment

• 2003-2009 Nissan 350Z (Z33 Platform, VQ35DE 2003-2006 / VQ35HR 2007-2009, RWD)
• 2003-2009 Nissan 350Z Nismo (Z33 Platform, VQ35HR 2007-2009, RWD)
• 2003-2006 Infiniti G35 Sedan (V35 Platform, VQ35DE, RWD)
• 2003-2007 Infiniti G35 Coupe (V35 Platform, VQ35DE, RWD)

Fitment Notes

• RWD models only - does not fit Infiniti G35x AWD (V35x) variants
• Does not fit Nissan 350Z Roadster (convertible) - different rear suspension geometry
• Does not fit 2007+ Infiniti G35 Sedan equipped with the VQ35HR engine
• Front spring rate change available at factory (±20 N/mm / ±2 kgf/mm) - rear spring rate change not available
• Rear damper adjustment is accessible via wire from outside the vehicle - no need to remove the damper to adjust rear damping
• Upper mounts are rubber bush front and rear

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
• Rear damping adjustable via wire - no damper removal required for rear adjustment
• Dual Preload Valve System (Dual PVS) suppresses unnecessary high-speed damping force for improved ride comfort
• Advanced bump stop rubber reduces body roll while maintaining compliance over large road impacts
• Strengthened rubber upper mounts absorb small vibrations while improving mount rigidity over stock
• PNE coating delivers 5x corrosion resistance compared to standard galvanizing
• 3-year manufacturer warranty backed by HKS in-house durability testing

Specifications

• Spring Rate - Front: 98 N/mm (10 kgf/mm) | Rear: 88 N/mm (9 kgf/mm)
• Free Length - Front: 220 mm (Straight Barrel) | Rear: Special Shape
• Damping Force at 0.1m/sec - Front: Rebound 1015 N / Compression 432 N
• Damping Force at 0.1m/sec - Rear: Rebound 579 N / Compression 319 N
• Damping Adjustment - Front: 30 Steps | Rear: 30 Steps (wire adjustable)
• Default Damper Position - Front: Step 15 | Rear: Step 15
• Upper Mount - Front: Rubber Bush | Rear: Rubber Bush
• Damper Layout - Front: Normal | Rear: Normal
• Damper/Spring Layout - Front: Coilover | Rear: Separate
• Front Helper Spring Rate: 19.8 N/mm
• Ride Height Range (vs. stock) - Front: -1 to -46 mm | Rear: -1 to -50 mm
• Default Ride Height at Shipment (vs. stock) - Front: -12 mm | Rear: -15 mm
• Factory Front Spring Rate Change: ±20 N/mm (±2 kgf/mm) | Rear: Not available

Included Components

• 2x Front Coilover Assemblies (with rubber upper mount and helper spring)
• 2x Rear Damper Assemblies (separate spring layout, wire-adjustable damping)
• 1x Spanner Wrench Set
• 1x Damper Adjustment Tool

Product Description

The HKS Hipermax S Coilovers (80330-AN010) are engineered for the Nissan 350Z (Z33) and Infiniti G35 RWD, covering the full production run of both platforms from 2003 through their respective final model years. The kit ships with a mild factory-default drop of 12mm front and 15mm rear, making it a plug-and-play daily driver upgrade that doesn't require immediate corner balancing. The 10 kgf/mm front and 9 kgf/mm rear spring rates provide firm, well-controlled body motion suited to the Z33's front-heavy weight bias and rear-wheel-drive dynamics.

A notable feature of this kit is the rear wire-adjustable damping - the 30-step dial on the rear can be reached without removing the damper from the car, making mid-session tuning adjustments at a track day or autocross quick and convenient. The front spring rate is also adjustable at the factory (±20 N/mm) for drivers who want a custom spring spec. The Dual Preload Valve System keeps high-speed damping smooth and predictable across all adjustment steps, and the rubber upper mounts on both ends provide adequate noise isolation for comfortable street use.