Hi there, very nice write up, been searching for this. If I may ask, if one were to purchase this item: http://www.ebay.com/itm/170745295905?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
would this write up still work? Any reason I cannot add this unit to my non-Navi/Sat model, such as...