I purchased the XM kit from the dealer for like 260 and installed it myself...the actual unit goes in the trunk and you have to remove the radio to plug in the wire from the back...total time is like 90 minutes...I was able to find the instructions on how to remove the trim pieces on the internet...I still have the PDF file I can send you...it's not hard as long as you are patient and handy...I couldn't justify paying the dealer over 250 in labor charges. sounds great by the way, much better than the skyfi2 i had installed in my prius with an fm modulator