Keep your hood, buy a sedan bumper and fenders are rare, if you find any. I was stumbling online and found the set of JDM STi fenders + side markers by random chance on ebay. 06's are rare and I haven't seen any. Typical wagon to sedan fitment, involves changing out front bumper, 2 fenders and everything else remains same: Headlights, hood, hood hinges, hood latch, bumper bracket. I do notice that the 2006's side skirts are radically different than the 05's so you'll need to buy sedan side skirts for conversion. 2006 wagon with 2006 sedan frond end, I have yet to see. Good luck on your conversion. I ordered my 2005 WRX bumper from dealer and side splitters were used (in Aspen White) but I had them repainted to match.