HRD Street Performance Coilovers for 2015-2021 Subaru WRX/STi

HRD Street Performance Coilovers are engineered to meet the needs of enthusiasts seeking enhanced suspension performance without disrupting the refinement of their ride quality. Leveraging use of our Dual Duty Digressive Damper™ technology, the engineering team at HRD has accomplished our goal of creating the ultimate suspension for cars driven on the street while retaining incredible control over pitch and dive characteristics, allowing you to be track day ready. Our research and development process started with a blank slate, allowing our engineers to be fixated on developing the ultimate performance suspension within a vacuum.

Each set of our Coilovers features our proprietary stainless steel pillowball bearings, designed to increase longevity on cars driven in all weather conditions. HRD also utilizes our own titanium hardware including top hat studs and nuts, damping adjustment knobs, and our pillowball bearing collars. Electrophoretic deposition (EDP coating) is used on all of our shock bodies to further increase the longevity of our Coilovers in adverse climates.

All of our off-the-shelf kits feature spring rates that have been meticulously selected by taking into account shock travel, motion ratios, and harmonic frequencies transmitted from the road into the cabin during street and track use. We've intentionally selected spring rates that are appropriate for each chassis, giving a balanced and refined driving experience that inspires confidence without the need to overspring our suspension.

Dual Duty Digressive Damper™

Each set of suspension from HRD features a monotube design utilizing our Dual Duty Digressive Damper™ technology. Digressive valving provides higher damping force at low piston speeds. This improves control during low-speed events such as cornering, braking, and acceleration, allowing for better vehicle stability and handling.

At higher piston speeds, the damping force levels off, allowing for softer reactions to bumps, potholes, and other road imperfections. This ensures that the ride remains both comfortable and refined while maintaining excellent tire contact with the road for improved grip.

This technology has allowed HRD to create a suspension system that feels balanced and predictable under all conditions. It provides the stiffness needed for precise handling during performance driving and the refinement required for everyday road conditions.

Monotube Construction

HRD's monotube damper design separates the damping oil and gas chamber with a floating piston. This configuration dissipates heat more effectively, ensuring consistent damping performance during prolonged or intense use, such as extended track days.

Our monotube design accommodates a larger piston, allowing for more precise and consistent damping control across the entire valving curve. This enhances the overall effectiveness of the suspension system, making it more responsive to both low-speed and high-speed events.

Monotube Coilovers are constructed with a single, larger-diameter tube, which is inherently stronger and more durable than alternatives such as twin-tube designs. This makes them ideal for high-performance applications where durability and reliability is paramount.

Electrophoretic Deposition (EDP) Coating

This advanced coating method involves submerging components in an electrically charged bath containing epoxy or acrylic resins. The electric current evenly deposits the coating onto the component’s surface, even reaching intricate crevices and hard-to-coat areas. Once applied, the coating is baked to create a durable, uniform finish that is highly resistant to corrosion, chipping, and wear. For coilovers, which are often exposed to harsh conditions such as road salts, debris, and moisture, EDP coating provides exceptional longevity and maintains both structural integrity and aesthetics.

Compared to alternative options like powder coating or zinc plating, EDP coating offers superior uniformity and coverage. Powder coating, while durable, can sometimes leave small gaps or uneven finishes in hard-to-reach areas, leading to potential corrosion vulnerabilities. Zinc plating, on the other hand, provides basic corrosion resistance but lacks the robustness and longevity of EDP coating, especially under extreme environmental stress. EDP coating helps ensure that your Coilovers maintain their appearance and functionality for years without premature wear even in adverse climates.

Swift Springs Standard

Swift Springs are celebrated as the pinnacle of suspension technology, thanks to their unique combination of material science and innovative engineering. The foundation of their superiority lies in their proprietary steel alloy, HS5.TW, which is lighter and more resilient than the silicon chrome steel alloys used by most competing spring manufactures. This also allows Swift to use less coils per inch on their springs, reducing unsprung weight from your suspension.

One of the defining characteristics of Swift Springs is their linear spring rate, which ensures consistent performance throughout the spring's compression range. This feature not only improves tire grip but also reduces unnecessary suspension movement, providing a predictable and stable driving experience. Additionally, Swift Springs exhibit minimal coil binding and harmonic vibration, which are common issues with alternative springs, ensuring long-term durability and comfort.

Features

• 15 Way Adjustable Compression and Rebound
• Dual Duty Digressive Damper™ Technology
• Proprietary Stainless Steel Pillowball Bearings
• Titanium Hardware on Studs, Nuts, and Pillowball Collars
• Titanium Damping Adjustment Knobs
• Swift Springs Standard on all HRD Street Performance Coilovers
• Anodized Aluminum T6 6061 Camber Plates and Mounts
• Monotube Damper with High Pressure Nitrogen
• Front Spring Rate: 7kg / Rear Spring Rate: 7kg
• Durable Anodized 7075 Aluminum Spanner Wrenches
• All-Weather EDP Coating on Shock Bodies
• Assembled in the United States
• 5 Year Limited Manufacture's Warranty

Track Ready, Daily Approved

Our Street Performance Coilovers were designed from the ground up for the enthusiast seeking a refined and composed ride on the street that simultaneously inspires confidence when pushed to the limits. We've intentionally engineered our suspension with the dual duty purpose many of us build our cars for - something you can enjoy thoroughly in your day to day use, while being ready to tackle weekend track days without breaking a sweat.

If you're seeking a transformative change to your car's suspension, elevate your driving experience with our Street Performance Coilovers. Built from the ground up for enthusiasts like you in mind that are looking for the ultimate dual duty solution.

Bespoke Builds Available

Alternative spring rates, longer travel shocks, super-lows and other options are available from HRD. While our off the shelf kits are designed as the ultimate plug and play solution for the majority of enthusiasts, our engineers are capable of building a bespoke set of Coilovers just for you. Lead times on customized Coilovers are between 4 and 8 weeks, subject to our manufacturing capacity. For more information on selecting specs for your bespoke set of HRD Coilovers you can email tech@happyracer.com or visit our website.

The HRD Way

It is our mission at HRD to engineer motorsport products that are transformative to how your vehicle feels both on and off the track. From the moment you begin the unboxing experience, you will feel the passion and love that has gone into even the smallest of details across the entire HRD product line. Our team has set out to create components that we would be proud to recommend to our friends and family. With no expense spared, it is our mission to redefine expectations for motorsport enthusiasts across the globe, and we hope that you will join us on this journey.

Warranty

HRD Street Performance Coilovers are covered under a 5 year limited manufacture's warranty. More information can be found on our warranty page.

Warranty Assurance:

At K2 Industries, your satisfaction is our priority, and we stand behind the quality of our products. Here's a brief overview of our warranty:

Defect Coverage:
If you find a defect after receiving your order, get in touch with us. We're committed to resolving the issue, whether it involves a replacement, repair, or refund.

Installation Note:
Please inspect your purchase before installation. Unfortunately, damages post-installation are not covered, so ensure everything looks good beforehand.

Claims Made Simple:
Need to make a claim? Reach out to us at support@k2-industries.com. We're here to assist you. Just keep your original packaging and documentation handy.

Your Satisfaction Matters:
Your trust in K2 Industries is appreciated. We're dedicated to ensuring your satisfaction with our quality automotive parts.

Shipping Information:

At K2 Industries, we strive to provide a seamless and efficient shopping experience for automotive enthusiasts like you. Our commitment is to deliver high-quality parts to your doorstep with the utmost care.

Fast and Reliable Shipping:
Many of our products are stocked in our local warehouse, ensuring swift processing and delivery. Orders placed for these items typically ship within 2-5 business days, allowing you to get your parts in no time.

Extended Selection, Global Reach:
To offer you a broader range of automotive parts, some items are sourced from trusted suppliers around the world. While these products might have a slightly longer processing time, we assure you that the wait is worth it for the exceptional quality and value they bring.

Shipping Transparency:
For products shipped internationally, we provide estimated delivery times on the product page. Rest assured, we are continually working to optimize our supply chain and minimize any potential delays.

Combined Shipments:
To streamline your shopping experience, if your order includes items from both our local warehouse and international suppliers, they may be shipped separately. You will receive separate tracking information for each shipment.

Questions or Concerns?
If you have any questions about shipping or would like assistance tracking your order, our dedicated customer support team is here to help. Feel free to reach out to us at support@k2-industries.com.

You can also track your order here

Thank you for choosing K2 Industries for your automotive needs. We appreciate your trust in us.