Cusco 660311A21 Front Sway Bar Anti-Roll Bar - 21mm

The Cusco 660311A21 is a 21mm front sway bar (anti-roll bar) engineered to replace the factory unit at the stock mounting locations. Upgrading from the OE 19mm bar to this 21mm unit delivers a 133% increase in stiffness, providing a meaningful improvement in cornering composure and high-speed stability without sacrificing everyday driveability.

Key Features:

• 21mm diameter solid steel construction — up from the factory 19mm bar for significantly greater torsional resistance
• Direct bolt-on replacement using factory mounting locations — no cutting or modification required
• Finished in Cusco's signature blue powder coat for corrosion protection and a distinctive appearance
• Includes necessary hardware and bushings for installation
• Reduces body roll during hard cornering and minimizes excessive shock absorber stroke for sharper handling response
• Allows tuning of understeer and oversteer balance depending on front/rear sway bar pairing

Cusco sway bars are designed to increase lateral stiffness while preserving standard ride comfort on normal driving surfaces — an advantage over simply increasing spring rates, which affects ride quality directly. The larger diameter steel bar provides greater resistance against torsion, keeping the chassis more level during cornering and reducing weight transfer between corners.

Cusco is a Japan-based premier performance tuner with extensive experience in GT, Formula, and World Rally competition, and their suspension components are trusted worldwide for quality and fitment precision.