welcome to the club,always good to see more hatch owners,i had 07 wrx hatch and now have 08 wrx hatch,as @Tidgy said dont put crap petrol in it i allways use shell vpower,a good easy upgrade is a good aftermarket panel filter,regualar oil changes wont hurt it,if your going to upgrade power at all i would concider upgrading the intercooler as its a week link on the wrx and wrx's,very small and very thin and the end caps are plastic and bonded on and can leak.if your not good with a power polisher then may pay to have a profesional give it a good polish,nice car by the way