For Installing an aftermarket car radioWires are color coded to match you new aftermarket radio - Carxtc wiring makes your installation quicker No need to tap or cut into factory harness Match color wire to same color on new radio harness Plugs into car harness and then other end into new radio. Fits SUBARU SPORT IMPREZA 2008 to 2012 WRX, Sti 08 09 10 11 12 2008 2009 2010 2011 2012