Whiteline Anti Roll Bar - Rear 16mm - Adjustable - GR86, GT86 & BRZGR86, GT86 & BRZ Whiteline Rear Anti Roll Bar 16mm 3 Position Adjustable The fitting of larger sway bars has two main effects, vehicle balance in terms of understeer and oversteer, and increased roll resistance. Both of these can provide increased overall grip levels that can be achieved by the vehicle. Genuine Whiteline anti roll bars are supplied in our signature "Silver Sparkle II" metallic powder coat. Whiteline anti roll bars come complete with