Fits 2005-2010 Mustang GT Coupe Fits 2011-2014 Mustang GT Coupe when used with M-18183-C upper strut mounts and M-18000-A shocks/struts or M-18000-C adjustable shocks/struts Gives a more aggressive looking stance as well as increased handling dynamics Lowers car approximately 1.0" Progressive spring, designed for increased handling and performance Use with M-18000-A, M-18000-C and M-5490-A for optimum performance Mustang Jounce Bumper Kit M-5570-A recommended with installation of springs May cause slightly harsher ride compared to stock springs M-18183-C Strut Mounts recommended for 2005-2010 Mustang GT Note: Some factory fasteners are one time use. Please reference a Ford service manual for reuse information and correct torque specifications. May require alignment after installation