So i have finally decided to order the hard wire kit from valentine1.com. I havn't seen a E93 V1 installation DIY, so i thought i would help fellow Vert owners by posting this thread. Initially i was going to pay to have it done (not usually into messing w/ wires on a 80k car) until i came across a review i found through Google. I won't attempt to plagiarize this review so click the link below for further instruction. The installation took me about 20mn and was a complete breeze. I would recommend using extra zip ties to cleanly hide the wires around the dome light like i did. Before reading this review i thought i was going to have to run the phone cable all the way to the glove box, but no you use the dome light right next to where you position the v1. good luck
http://www.safeer.us/?p=281
