So here's the story: I recently got a 2013 WRX Premium with the standard non-nav HU. After regretting not getting the new OEM Fujitsu Ten Nav unit I was able to fish for one at a very good price. Problem is non-nav harness is completely different from Nav harness. The seller of the Nav unit said he still has the whole dash harness assembly for it and willing to sell it. So here're my questions:
1) The nav harness is coming from a 2012 Impreza. Will it be plug and play in my WRX?
2) How hard is it to do this harness swap? will it involve rewiring the whole car or something?