I am not familiar with the head unit - do you have a pic you can post up as if it is a combined Sat Nav AV unit you will lose it. But you can by after market units with SatNav included
Wotcha and welcome - love a hatch me
feel free to get stuck in post photos etc - a few hatch owners who have completed mods as members, food for thought. GMInsite may end up taking the one off his, had a few other bits for sale also
here are some options I am considering
http://www.ebay.co.uk/itm/380053025857?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
http://www.ebay.co.uk/itm/380053026996?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
But not the bonnet scoop as I like the wrx / sti bonnet
Should be a straight swop however dependant on your wheel width you may feel a little bit of lateral movement when cornering with the tyre wall not being upright if the tyre is wider than the wheel. I felt it going from 205's to 235's a few years back