KYB 5510022 Suspension Strut - Front Left

KYB Gas-a-Just Front Left Strut for WRX STI

The KYB Gas-a-Just 5510022 is a monotube suspension strut built as an OE-style replacement for the front left position. It is engineered to restore the original control and handling of the Subaru WRX STI while delivering quick response under demanding driving conditions.

Compatible With 2015-2017 Subaru WRX STI, front left, this strut uses a high-pressure monotube design that separates gas and oil for consistent damping response. The Gas-a-Just line is focused on restoring factory ride behavior while adding immediate performance when the suspension is loaded.

Key Features

• Monotube OE replacement strut for the front left suspension position
• High-pressure gas and oil separation for fade-resistant operation
• Triple chrome plated piston rod helps reduce seal wear
• Quick gas pressure response improves steering feel
• Supports proper operation of vehicle electronic safety systems
• B-stop and R-stop included in the design
• Part number 5510022 for direct application lookup

Product Details

KYB Gas-a-Just struts are built around a two-chamber monotube layout: an air-free hydraulic working area for control and a high-pressure nitrogen gas chamber with a floating piston for added responsiveness. That design helps maintain stable damping during normal driving and delivers firmer reaction when the suspension is working harder. For Subaru WRX STI owners, 5510022 is a direct-fit front left strut choice that supports the vehicle’s original suspension behavior.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. KYB also recommends replacing the strut mount, part number SM5664, and protecting the assembly with strut boot SB123 to reduce noise, vibration, and contamination.

What It Helps Address

• Excessive front-end bounce or oscillation
• Reduced steering response during lane changes or cornering
• Fluid leakage from a worn strut assembly
• Uneven damping that affects ride control
• Suspension performance loss that can affect electronic safety systems

Installation Notes

Fits 2015-2017 Subaru WRX STI, front left. Replace the suspension strut and coil spring assembly according to the manufacturer’s instructions. Verify upper mount thread size and suspension condition before installation. For reduced noise and vibration, install new strut mounts during service and inspect the boot and related hardware for wear.

Quality Assurance

KYB designs the Gas-a-Just line as an OE monotube replacement to restore factory suspension capability. The 5510022 is built to match the intended control characteristics of the Subaru WRX STI front suspension and to maintain consistent damping performance under normal and performance driving conditions.