Take your vehicle's handling to the next level with PERRIN Performance sway bars. Upgrading your sway bar is the easiest way to improve vehicle handling. Sway bars increase roll resistance and modify vehicle balance. In general, adding a larger rear sway bar increases over steer, and adding a larger front sway bar increases under steer. Upgrade both front and rear sway bars to reduce body roll and tune vehicle balance to your preference.PERRIN Performance Rear Sway Bars are adjustable with three end link mounting holes, this allows adjustment to the stiffness of the bar. Finished in a glossy red powder-coated finish for long-lasting good looks. 2008 WRX: PERRIN 16mm Bar Hole #1 -9% Stiffer than 15mm OEM bar PERRIN 16mm Bar Hole #2 25% Stiffer than 15mm OEM bar PERRIN 16mm Bar Hole #3 60% Stiffer than 15mm OEM bar 2009-2014 WRX / STI: PERRIN 22mm Bar Hole #1 -5% Stiffer than 16mm OEM bar PERRIN 22mm Bar Hole #2 Same as OEM 16mm Bar PERRIN 22mm Bar Hole #3 5% Stiffer than 16mm OEM bar 2013-2016 BRZ / FRS: PERRIN 22mm Bar Hole #1 30% Stiffer than 14mm OEM bar PERRIN 22mm Bar Hole #2 65% Stiffer than 14mm OEM bar PERRIN 22mm Bar Hole #3 116% Stiffer than 14mm OEM bar 2017-2021 BRZ / 86: PERRIN 22mm Bar Hole #1 -9% Stiffer than 15mm OEM Bar PERRIN 22mm Bar Hole #2 25% Stiffer than 15mm OEM Bar PERRIN 22mm Bar Hole #3 60% Stiffer than 15mm OEM Bar 2022-2023 BRZ / GR86: PERRIN 22mm Bar Hole #1 30% Stiffer than 14mm OEM bar PERRIN 22mm Bar Hole #2 65% Stiffer than 14mm OEM bar PERRIN 22mm Bar Hole #3 116% Stiffer than 14mm OEM bar for BRZ / FR-S / GR86 for WRX / STI