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They will modify handling balance in terms of steering bias (understeer or oversteer), and they will increase roll resistance. The installation of a larger rear sway bar will provide a more neutral handling feel with oversteer when you want it.
Whiteline sway bars for the Mazdaspeed3 are available in a bolt on and go fixed design or an adjustable design, allowing you to dial in your desired front or rear stiffness. Whether you are building a time attack monster or just sprucing up your daily driver, you can be sure there is a Whiteline swaybar to suit your needs. All Whiteline sway bars are constructed from solid steel and come in "Silver Sparkle II" metallic powder coat color. Replacement polyurethane bushings, installation grease and instructions are included in each Whiteline swaybar kit for your Mazda.