Like the titile says.

I've got an 03 (first year of the current body style) and the nav is well, from 03. Does anyone know how hard it is to put the new nav system (from say a 07 or 08) into and older Rover?

 

03 and 04 use the same, then 05 and up are the same... its not easy, and deffinitly not cheap. everything about the system, including radio, wiring harness, fiber optic harness, screen, nav unit, antenna, amplifier would need to be changed. also the abs would need to be rewired. its no easy task