COBB Rear Sway Bar 24mm 3 Position Adjustable – 2008-2021 Subaru WRX/ STI

Cobb Rear Sway Bar — 24mm Adjustable — 2015-2021 Subaru WRX / STI

The Cobb 24Mm Adjustable Rear Sway Bar for the 2015-2021 Subaru WRX is a standalone hollow steel sway bar for the VA WRX/STI platform. 24MM ADJUSTABLE diameter hollow steel provides adjustable stiffness via two or three mounting positions on the bar end.

DETAILS

• Platform: 2015-2021 Subaru WRX, 2015-2021 Subaru WRX STI
• Position: rear sway bar — 24mm adjustable diameter
• Hollow steel construction — stiffness at reduced weight vs solid
• Adjustable end positions — tune handling balance
• Polyurethane mounting bushings included
• End links sold separately or included in Cobb Sway Bar Package

24Mm Adjustable Hollow Steel Rear Bar for the VA WRX/STI

A sway bar — also called an anti-roll bar — connects the left and right suspension corners through a torsional spring that resists the body roll generated during cornering. When the car corners, weight transfers to the outside wheels and the body rolls away from the corner. The sway bar transfers some of this load back to the inside wheel, keeping both suspension corners working more evenly and reducing the angle of body roll. A stiffer sway bar produces less body roll for a given cornering load — the car stays flatter through corners, the suspension geometry changes less, and the driver experiences more predictable, communicative handling. The front and rear sway bars work together to define the car’s handling balance: a stiffer front bar increases understeer tendency; a stiffer rear bar increases oversteer tendency. The correct combination is determined by the chassis balance goals of the build.

Adjustable End Positions and Standalone Installation

The 24mm adjustable rear bar is the standalone option for VA WRX/STI owners who want to replace or upgrade one bar independently — adding a stiffer rear bar to increase rear grip balance, or replacing a damaged front bar with the correct Cobb specification. The adjustable end positions allow the effective stiffness to be changed by moving the end link attachment point — closer to the center of the bar reduces effective stiffness; further outboard increases it.

What’s in the Box

• Cobb 24mm adjustable rear sway bar
• Polyurethane mounting bushings
• Mounting hardware

Why Choose Cobb Tuning

Cobb Tuning has been developing performance software and hardware for turbocharged enthusiast vehicles since 1999. Founded in Austin, Texas, Cobb built its reputation on the Accessport and expanded into a full catalog of hardware engineered to complement it. Every OTS map is developed in-house on real vehicles, and every hardware product is validated as part of a complete system — not sourced and sold in isolation. That integrated approach is why Cobb produces consistent, reliable results across the builds we see every day.

The RallySport Take

The Cobb 24mm adjustable rear sway bar for the VA WRX/STI is the standalone bar for targeted handling balance adjustment. For a complete front and rear upgrade with end links and bushings included, the Cobb Sway Bar Package is the correct purchase.

Fitment

Year	Make	Model	Notes
2015-2021	Subaru	WRX	FA20DIT
2015-2021	Subaru	WRX STI	EJ257