BLOX Racing BXSS-10120-R 24mm Rear Sway Bar 2015-2021 Subaru WRX STI VA 3-Way Ad

Vehicle Fitment

• 2015-2021 Subaru WRX (VA) - Rear
• 2015-2021 Subaru WRX STI (VA) - Rear

Fitment Notes

• Rear axle position only - sold as a single rear sway bar. The companion front bar is BXSS-10120-F (26mm); a combined front and rear set is available as BXSS-10120-SET.
• Fits the VA-generation WRX and WRX STI (2015-2021). Does not fit the GR/GV (2008-2014) or VB (2022+) generation WRX. A separate part number covers the GR/GV generation.
• Polyurethane bushings are included and are size-specific for the 24mm bar - no separate bushing purchase required.
• 3-way adjustable end link mounting allows tuning of rear roll stiffness without replacing the bar - softer, medium, or stiffer setting selectable by choice of mounting hole at the end links.
• A wheel alignment is recommended after installation if ride height or corner balance changes are made in conjunction with the sway bar upgrade.

Features

• BLOX Racing 24mm rear sway bar for the 2015-2021 Subaru WRX and WRX STI - a 55Cr3 chromium steel solid-bar upgrade that increases rear lateral stiffness to reduce body roll and improve cornering balance. On the VA WRX platform, upgrading the rear sway bar is one of the most effective handling modifications available, tightening transient response and reducing understeer by increasing rear roll resistance to better match the grip available at the rear tires.
• 55Cr3 chromium steel construction - the same high-grade chromium steel alloy used in OEM and high-performance aftermarket sway bars. Provides high tensile strength and fatigue resistance for long service life under repeated torsional loading.
• Solid bar, not hollow - solid construction provides more consistent torsional stiffness across the bar's effective length compared to hollow alternatives, with no risk of internal corrosion or wall collapse at high stress points.
• Precision CNC bent - ensures consistent geometry and mounting position across every bar, with no variation from hand or hydraulic bending processes.
• Forged ends, not welded - the end link attachment points are forged as part of the bar rather than welded on, eliminating the weld heat-affected zone as a potential failure point under high-cycle fatigue loads.
• 3-way adjustable end link mounting - three mounting holes at each end allow adjustment of effective sway bar stiffness without removing the bar, providing a softer, medium, or firmer rear roll rate setting to suit driving style, track conditions, or alignment setup.
• Size-specific polyurethane bushings included - BLOX Racing's exclusive formulation eliminates the squeak and dry-out issues associated with OEM rubber bushings, requiring no lubrication over the service life of the bushing.
• Subjected to vigorous stress, fatigue, and 72-hour corrosion salt spray testing before release.

Specifications

• Part Number: BXSS-10120-R
• Position: Rear
• Diameter: 24mm
• Construction: Solid (not hollow)
• Material: 55Cr3 Chromium Steel (hot rolled)
• End Type: Precision Forged (not welded)
• Bending: Precision CNC Bent
• End Link Mounting: 3-Way Adjustable
• Bushings: Size-Specific Polyurethane (included, no lubrication required)
• Corrosion Testing: 72-Hour Salt Spray
• Quantity: 1 (rear bar only)

Included Components

• 1x BLOX Racing 24mm Rear Sway Bar
• Size-Specific Polyurethane Bushing Set
• Mounting Hardware (as applicable)

Product Description

The BLOX Racing BXSS-10120-R is a 24mm solid chromium steel rear sway bar for the 2015-2021 Subaru WRX and WRX STI (VA generation). The bar is manufactured from 55Cr3 chromium steel with precision CNC bending and forged (not welded) end link attachment points, eliminating the weld heat-affected zone that is the common failure location on lesser sway bars under high-cycle fatigue loading. Size-specific polyurethane bushings are included and require no lubrication.

The 3-way adjustable end link mounting allows rear roll stiffness to be tuned without removing the bar - three hole positions at each end provide a softer, medium, or stiffer effective roll rate. On the VA WRX platform, the rear sway bar upgrade is among the most impactful single handling modifications available, increasing rear lateral stiffness to reduce understeer and body roll through corners. The companion front bar (BXSS-10120-F, 26mm) and front-and-rear set (BXSS-10120-SET) are available separately. Backed by BLOX Racing's ISO 9001 certified manufacturing standards and subjected to 72-hour corrosion salt spray testing.