i have installed this unit before..along with alpine DVD units..but not in a porsche. Thats the thing...the shop tells you they specialize in porches and thats how they get you....any reputable shop shouldnt charge you more than $500 for the install...its barely a 4-6hr job for an experienced installer....and 10hrs at max for someone whos going off a sheeet of instructions....with all the info online these days you can find all the info you need...