I work at a sign shop that does cell phone booster installs and bluetooth kits, we kinda got pulled in because of the nature of the work being that people with businesses need signs and we used to do stereo work anyways and the fact cell service sucks around here. Personally i use a booster in my car Wilson makes the best kits hands down 20-50 miles past the point you lose the service and as for bluetooth hookups u used to use motorola HF1000's which worked well for just connecting the phone but we slowly moved to parrot kits for ease of install most of the time it was just plug and play hide the wires done, but our supplier couldnt help me out with that harness for my x-type so i havent installed one yet but ive done tons of these installs and personally i would say a parrot kit is where its at clear clean voice over the speakers and it doesnt sound like your in a tunnel to the other person. after every install i call my boss in the other room to verify everything is working good and the first parrot kit we did he asked why i called him from the other room on my cell he had no idea it was over the bluetooth connection he said it was as clear as holding the handset