The PSR Subaru VA STI Stage 4 Handling Kit is designed for the serious enthusiast looking to extract every ounce of grip from their AWD platform. Taking the incredible foundation of our Stage 3 kit - including XYZ Coilovers, comprehensive bush upgrades, geometry correction, and adjustable rear arms - we turn our attention to complete anti-roll technology.

To keep the chassis perfectly flat through high-speed corners, we introduce an upgraded Whiteline Heavy Duty Front Sway Bar to match the rear, drastically reducing body roll and balancing out the factory understeer.

Because upgrading the sway bars puts massive extra stress on the factory plastic or thin metal end links, we also supply heavy-duty Whiteline Front and Rear Sway Bar Links. These upgraded links guarantee zero flex and instantaneous load transfer from the chassis directly to the sway bars, making the car incredibly responsive during rapid changes of direction.