I installed it myself...i have done everything myself from rims to grill...everything...its a gt line and ty for the complimentLooks great! Very aggressive looking and stylish. GT-Line or GT? Who did the speaker install? You will find a common theme here that most K5 owners here would like to improve sound quality and while information is trickling in as the car gets "older" and people tinkering with it, we are all hungry for more stereo info lol.