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HKS HIPERMAX S Full Kit (15 - 21 WRX STI) - HKS

HKS HIPERMAX S Full Kit (15-21 WRX STI) (HKS80300-AF009)

HKS80300-AF009

$ 1,976.00

HKS HIPERMAX S Full Kit (15-21  WRX STI)

After 9 years after the launch of MAXIV GT, the new HIPERMAX S series was born for superior “Driving Comfort" with advanced features in damping force, durability, and appearance. The new HIPERMAX S series continues to employ the single-tube structure. The advantage of this structure is to be able to provide the gas and oil chamber separately, and then it allows to use of a large diameter piston. As a result, a quality and stable damping force is gained. The Pre-load Valve System, introduced in the previous MAX IV GT 20 Spec, S-Style L, and S-Style C, created a remarkable difference in handling performance. This has been further refined to introduce “Dual PVS”.

High-speed damping is reduced while keeping unnecessary movement to a minimum. The improved shape of the needle expands the oil relief channel. Each step of the 30-step adjustment is now more prominent. Having softer adjustment options gives more options for street driving. For HIPERMAX S, a further improved “ADVANCED BUMP RUBBER” was developed which pursues further softness and also shorter variations delivering a wide range of options for a variety of cars delivering a natural and smooth experience. HKS previously introduced SNOW EDITION versions to combat corrosion head-on. The result of this development was PNE coating delivering 5x better durability compared to standard galvanizing.

Features

  • Dual PVS. We evolved the existing preload valve system to the dual preload valve system to suppress the generation of unnecessary damping force during higher piston speeds. This provides major improvement in ride comfort without influencing the driving performance.
  • Wide Range Damping Force Adjustment Mechanism. The improved shape of the Needle Jet expand the range of damping force adjustment. This makes us possible to handle driving on a wider range of stages.
  • Evolution of Bump Stop Rubber. A new shape of bump stop rubber reduces the body roll and achieves ride comfort at the same time which cannot be achieved with general hydro bump stop rubber.
  • Low Friction Technology. With advanced tribology technology, we have achieved even higher durability and lower friction than conventional products. This technology contributes to improved ride quality and handling performance.
  • Single Tube
  • 30 Levels Adjustable Damping
  • Shock-Body Length Adjustable
  • Special Oil
  • PNE Coating
  • Dual Pre-Load Valve System
  • Aluminum Bracket
  • Rubber Upper Mount
  • Spring Rate [N/mm(kgf/mm)]: F=88(9.0) | R=69(7.0)
  • Spring Length (mm): F=220 (Straight Barrel Type) | R=170 (Straight)
  • Height at Factory (Upper-Lower): F=-19(0 to -41) | R=-14(0 to -59)
  • Upper Mount: F=Rubber | R=Rubber
  • Spring Rate Change at Factory [Changeable Spring Rate N/mm(kgf/mm)]: F=Possible [±10 (1)] | R=Possible [±10 (1)]

Benefits

  • Improved Handling Performance and Feel
  • Offers a Lowered Look

Applications

  • 2015-2021 Subaru WRX STI

What's In The Box?

  • 1 - Hipermax S Coilover Kit

Warranty

  • HKS' Limited Warranty

HKS provides a one-year warranty to the original purchaser of HKS products against defects in materials and workmanship. Please contact your seller with the original Purchase Order, photos, video, and reason for your claim. The seller will work with the Authorized Distributor directly to file a claim. Purchasing the product through an unauthorized seller may void your warranty.

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HKS

HKS is a renowned Japanese performance parts manufacturer, specializing in high-quality turbochargers, exhaust systems, suspension components, and engine management products. Known for their precision engineering and innovative designs, HKS products are trusted by car enthusiasts and professionals alike to enhance vehicle performance, reliability, and tuning potential. With a focus on motorsport and street applications, HKS continues to lead the industry in providing cutting-edge solutions for high-performance vehicles.

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Popular FAQs

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Why Should I Buy HKS Products from JD Customs USA?

Why Should I Buy HKS Products from JD Customs USA?

JD Customs USA is a trusted source for authentic HKS performance parts, offering enthusiasts a reliable way to purchase legendary Japanese-engineered upgrades with confidence. When you buy HKS products from JD Customs USA, you’re choosing a retailer that understands performance tuning, vehicle-specific fitment, and the heritage behind one of the most respected brands in motorsports.

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Yes. All HKS products sold by JD Customs USA are 100 percent authentic and sourced through authorized distribution channels. This guarantees genuine HKS manufacturing standards, materials, and performance characteristics.

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Absolutely. HKS offers a wide range of components that are often part of complete performance systems, not just standalone parts. JD Customs USA helps customers confirm:

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JD Customs USA is built around enthusiast platforms and performance-driven builds, not generic catalog listings. Many issues arise when customers select HKS parts without understanding how they integrate with the rest of the vehicle.

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