KYB Gas-a-just Front Right Monotube Strut for 2015–2017 Subaru WRX STI – Part Number 5510021

The Gas-a-just monotube strut is available as an OE monotube replacement to restore your vehicle's original capabilities. The KYB Gas-a-just has two separate working chambers: An air-free hydraulic piston and valve area for responsiveness and control, and a second high-pressure nitrogen gas area with a floating piston that provides a comfortable ride during normal driving and adds instant performance on demand.

• Protect your new struts from dirt, debris and salt with a KYB Strut Boot, part number: SB123

The KYB Gas-a-just front right monotube strut, part number 5510021, is designed as an OE-style replacement for the 2015–2017 Subaru WRX STI. It helps restore the vehicle’s original ride control, handling response, and suspension performance with a durable monotube design engineered for demanding street and performance-driving conditions.

The KYB Gas-a-just uses two separate working chambers. An air-free hydraulic piston and valve area provides responsive damping and precise control, while a high-pressure nitrogen gas chamber with a floating piston helps maintain consistent performance. This design delivers a comfortable ride during normal driving and provides additional damping response when driving conditions require greater control.

• Feature: OE-style monotube replacement designed to help restore original suspension capabilities.
• Feature: High-pressure nitrogen gas chamber supports consistent damping performance.
• Feature: Floating piston separates the gas and hydraulic fluid to help reduce aeration.
• Feature: Front right application engineered for responsive handling and improved vehicle control.

Product Specifications and Technical Data

• Brand: KYB
• Part Number: 5510021
• Product Type: Gas-a-just monotube strut
• Position: Front right
• Vehicle Application: Subaru WRX STI
• Model Years: 2015, 2016, and 2017
• Gas Technology: High-pressure nitrogen with floating piston
• Replacement Type: OE-style suspension replacement

What's Included

• One KYB Gas-a-just front right monotube strut, part number 5510021

For added protection against dirt, debris, and road salt, KYB recommends pairing the strut with a KYB Strut Boot, part number SB123. Verify vehicle configuration and suspension compatibility before installation.

Features:

• OE-style monotube replacement designed to help restore original suspension capabilities.
• High-pressure nitrogen gas chamber supports consistent damping performance.
• Floating piston separates the gas and hydraulic fluid to help reduce aeration.
• Front right application engineered for responsive handling and improved vehicle control.

Fitments:
2015 Subaru WRX STI Base
2015 Subaru WRX STI Launch Edition
2015 Subaru WRX STI Limited
2016 Subaru WRX STI Base
2016 Subaru WRX STI Limited
2016 Subaru WRX STI Series.HyperBlue
2017 Subaru WRX STI Base
2017 Subaru WRX STI Limited

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1