BLOX BXSS-03505 Street Series II Plus Coilovers 32-Way for 15-21 Subaru WRX STI

Vehicle Fitment

• 2015-2021 Subaru WRX (FA20DIT / EJ257, 2.0L / 2.5L Turbo H4, AWD)
• 2015-2021 Subaru WRX STI (EJ257, 2.5L Turbo H4, AWD)

Fitment Notes

• Does not fit 2022+ Subaru WRX - the 2022 WRX uses a revised chassis (VB) and is not compatible with this kit
• Does not fit 2022+ WRX STI - the STI was discontinued after the 2021 model year in the VA-chassis generation
• Fits both WRX and WRX STI on the VA-chassis platform (2015-2021) - no trim exclusions within this generation
• Top mounts are included - no separate purchase required for a complete installation
• Spring rates are application-specific and selected by BLOX Racing for the WRX/STI platform - verify with BLOX Racing if running significantly heavier or modified suspension loads

Features

• 32-way fully adjustable damping - dial in compression and rebound across a wide range to suit street, canyon, or track driving preferences
• Twin-tube shock design with high-viscosity oil for consistent damping feel and smooth, comfortable ride quality at all adjustment settings
• Threaded spring perch body allows precise ride height adjustment independent of damping settings
• CNC-wound SAE 9254 spring steel coils - heat-treated and shot-peened for deformation resistance and high fatigue endurance
• Powder-coated springs for corrosion and rust resistance in harsh weather conditions
• Application-specific spring rates front and rear - tuned to the weight distribution and suspension geometry of the 2015-2021 WRX/STI
• Dyno and cycle tested for verified performance and long-term reliability
• Pre-assembled complete kit - includes coilovers, top mounts, dust covers, bump stops, and spanner wrenches; no additional hardware required

Specifications

• Damping Adjustment: 32-way
• Shock Design: Twin-tube
• Shock Fluid: High-viscosity oil
• Spring Material: SAE 9254 spring steel (CNC-wound)
• Spring Treatment: Heat-treated, shot-peened, powder-coated
• Spring Rates: Application-specific (tuned for 2015-2021 Subaru WRX / WRX STI)
• Ride Height Adjustment: Threaded adjustable spring perch
• Platform Compatibility: Subaru VA chassis (2015-2021 WRX / WRX STI)
• Quantity: 4 coilovers (complete set - front and rear)

Included Components

• 2x Front Coilover Assemblies (pre-assembled with springs and top mounts)
• 2x Rear Coilover Assemblies (pre-assembled with springs and top mounts)
• 4x Dust Covers
• 4x Bump Stops
• 1x Spanner Wrench Set

Product Description

The BLOX Racing Street Series II Plus Coilover System (BXSS-03505) is a complete, fully adjustable suspension kit engineered specifically for the 2015-2021 Subaru WRX and WRX STI on the VA chassis. Built around a 32-way adjustable twin-tube shock design filled with high-viscosity oil, this system gives drivers the ability to fine-tune damping at each corner of the vehicle - softening for daily comfort or stiffening for spirited driving and track use - without sacrificing baseline ride quality. The wide damping range makes it equally capable as a daily-driven street setup or a weekend canyon and autocross weapon.

Each coilover in the kit uses CNC-wound SAE 9254 spring steel coils that have been heat-treated, shot-peened, and powder-coated for maximum durability and fatigue resistance. Spring rates are selected by BLOX Racing specifically for the front and rear weight distribution of the WRX and STI platform, delivering a balanced and predictable handling character out of the box. The threaded body design allows ride height to be adjusted independently of damping, giving full control over stance and corner weight without compromising shock travel. Every system is dyno and cycle tested before leaving the facility to ensure consistent, verified performance.

The BXSS-03505 arrives fully pre-assembled and complete - high-quality top mounts, dust covers, bump stops, and a spanner wrench set are all included, so no additional suspension hardware is needed for installation. This is a bolt-in solution for WRX and STI owners looking to replace worn factory struts, lower the vehicle for improved handling and aesthetics, or simply gain meaningful control over their suspension tuning for the first time. For the 2008-2014 WRX/STI generation, see the BLOX Racing BXSS-00520.