Is it just a straight swap? What im wondering is because i have BOSE at the moment do i need to get a BOSE RNS-e or anything? When i turn my car on at the moment bose pops up on my screen which looks pretty cool so if i get a new head unit does it know? Also my car has the bluetooth kit so will that work with an RNS-e without any modifications? Sorry for all questions, cheers in advance.