Don, the instructions included tell how to determine if the car is prewired. My 04 Base was not, a friend's 03 wasn't either. It seems like Tourings may be, but the only way to be sure is to look at the terminals in the Multifunction switch connector.
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2004 Dark Plum Base with windows tinted, cabin filter, silencers removed, fog lights, 18\'s, all Red taillights, Blaine\'s struts, modesty cover, color-matched center dash, 06 rear bumper
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