Rear Sway Bar – 15-18 Subaru WRX/STI

High-performance rear, 3 hole adjustable sway bar designed for the 15-17 Subaru WRX/STI. Includes polyurethane bushings and bushing grease. Available in 19mm, 22mm, and 24mm.




2015-18 Subaru WRX/STI Rear Sway Bar

Sway-A-Way’s 2015-2018 Subaru WRX / STI rear sway bar is designed to replace the factory sway bar with an adjustable larger diameter sway bar. Stock, the 2015+ Subaru WRX & STI both come equipped with a 20mm rear sway bar. Sway-A-Way offers a 22mm and 24mm replacement each with three holes of adjustment. Please refer to the table below for stiffness increases over the factory bar. Both sway bars offer a sizable increase in stiffness resulting in less body roll for better overall handling. These larger sway bars will remove understeer giving the car a more neutral to oversteer feel.

Sway Bar Stiffness Increase Chart

Sway-A-Way 2015-18 Subaru WRX/STI Rear Sway Bars Compared to Stock 20mm

Sway BarHole 1Hole 2Hole 3

CNC Bent to Factory Profile

Sway-A-Way uses in-house 3D scanning equipment and a CNC bender to precisely match the factory sway bar profile.

Precision Forged Ends

Through processes mastered over the last 30+ years, Sway-A-Way uses induction heating, presses, CNC plasma cutting, and custom tooling to craft forged ends. This combination of CNC bending and forged ends results in a sway bar that is both strong, accurate and ready for the track.

Bushing Collars

Sway-A-Way’s 2015-2017 Subaru WRX/STI Rear Sway Bar uses welded on bushing collars to prevent lateral sway bar movement, keeping the sway bar centered.

Powder Coated for Corrosion Resistance

Sway-A-Way sway bars all receive a red powder coat for lasting corrosion resistance.

Polyurethane Bushings & Grease

Included with every sway bar are two polyurethane bushings cast specifically for the stock bushing bracket and Energy Suspension Formula 5 Polyurethane Grease. These bushings & grease are sourced directly from Energy Suspension, the leader in performance polyurethane products.

Pair this rear sway bar with the Sway-A-Way front sway bar in our 2015-2018 Subaru WRX/STI Front & Rear Sway Bar Kit. This kit reduces front and rear body roll, improves overall handling and grip, and removes factory understeer.

Sway-A-Way designs and manufacturers all Subaru sway bars in its Chatsworth, CA facility. Sway-A-Way’s Subaru sway bars are warrantied from defects in material and workmanship under normal use and service for a period of (2) two years from the date of sale to the original purchaser. Please review our complete warranty agreement.

Tech Specs

Sway Bar
22mm/24mm – CNC Bent – Forged Ends – Welded Collars – Powder Coated

3 Hole:
Hole 1: +71% Stiffness
Hole 2: +50% Stiffness
Hole 3: +34% Stiffness

Hole 1: +126% Stiffness
Hole 2: +99% Stiffness
Hole 3: +77% Stiffness

Powder Coat
Red Powder Coat

Polyurethane Bushings – Fits stock bushing bracket.

Energy Suspension – Formula 5 Pre-lube
The best grease on the market for polyurethane bushings.

Front 2015-2018 Subaru WRX/STI Endlinks

Rear 2008-2018 Subaru WRX/STI/BRZ Endlinks

Additional information


22mm, 24mm


08-17 Subaru WRX/STI, 13-16 Subaru BRZ



22mm - Hole 1:

+71% Stiffer than 20mm OEM bar

22mm - Hole 2:

+50% Stiffer than 20mm OEM bar

22mm - Hole 3:

+34% Stiffer than 20mm OEM bar

24mm - Hole 1:

+126% Stiffer than 20mm OEM bar

24mm - Hole 2:

+99% Stiffer than 20mm OEM bar

24mm - Hole 3:

+77% Stiffer than 20mm OEM bar

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