Perrin [08-21 WRX/STI, 17-21 BRZ] Rear Adjustable Sway Bar 25mm | PSP-SUS-234

PERRIN Performance 25mm Adjustable Rear Sway Bar

Transform your WRX, STI, BRZ, or 86's handling with the PERRIN Performance 25mm adjustable rear sway bar. Engineered to reduce body roll and fine-tune vehicle balance, this upgrade delivers precise control and confidence through every corner.

Key Features:

• Three-position adjustability – Dial in your preferred stiffness with three end-link mounting holes
• 25mm diameter – Maximum stiffness for aggressive handling improvements
• Glossy red powder-coated finish – Durable, corrosion-resistant, and unmistakably PERRIN
• Direct bolt-on installation – No modifications required

Performance Gains by Vehicle:

2008 WRX (vs. 15mm OEM):
Hole #1: 550% stiffer | Hole #2: 720% stiffer | Hole #3: 900% stiffer

2009-2014 WRX/STI (vs. 16mm OEM):
Hole #1: 400% stiffer | Hole #2: 530% stiffer | Hole #3: 720% stiffer

2015-2017 WRX/STI (vs. 20mm OEM):
Hole #1: 105% stiffer | Hole #2: 160% stiffer | Hole #3: 240% stiffer

2018-2021 WRX/STI (vs. 19mm OEM):
Hole #1: 150% stiffer | Hole #2: 210% stiffer | Hole #3: 300% stiffer

2017-2021 BRZ/86 (vs. 15mm OEM):
Hole #1: 550% stiffer | Hole #2: 720% stiffer | Hole #3: 900% stiffer

Why Upgrade Your Sway Bar?

Sway bars are the easiest and most effective way to improve handling. A larger rear sway bar increases oversteer for sharper turn-in and more neutral balance. Pair with a front sway bar upgrade to minimize body roll and customize your vehicle's dynamics to match your driving style.