Hey guys I know there are a number of threads already in this forum with this same type of question, and therefore I am hoping to build a single thread here that others can refer to to find the answer to my question: What is required for a Concert II with Bose (Single DIN) to aftermarket head unit conversion? If someone can please list the parts (and part numbers) and links to the parts that would be much appreciated. Looking at getting one of these: Alpine iDA-X313 Bluetooth The reason I want to go this way is like many others here: Its expensive to do the Double Din conversion with an RNS-E (or similar) unit. The iPod / iPhone / Aux add-ons like the Dension unit are not really the best and the headunit functionality is quite limited. Aftermarket units have more functionality and integrate better with mp3 players, ipods & iphones.