Hi.. I have an Aussie delivered 09 370Z. It has the same Bose sound and nav system as the NA delivered model but the only difference is that it doesnt have a USB input and the built in hard drive. My question is that is it possible to replace the aussie unit with one from NA without alot of hassel. if its straight forward does any one have a factory bose unit with Nav and hard drive that they are will to sell.