Yes, I know it'll be expensive - guess that's why I'm asking the prices. I'm sure it'll be WAY beyond practical to do something like that.
But looking at what the Nav Package adds, if you have the Touring model, the amp/speakers are already there (not so if you're base/NISMO). To add Nav it looks like the big pieces would be the head unit, LCD, and the control faces for radio and nav. I'd expect you'd be able to still use the tuner unit and amp on the Touring Bose package. Now, if you can use the existing harnesses - for economy sake, I'd pre-wire the same harness regardless of stereo trim to save costs, but you never know with car manufacturers these days.
Would this cost a pretty penny? I'd imagine quite a bunch. But it looks (on the surface, at least) it can be done reasonably painlessly - at least compared to other OEM designs.
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