1.
TBE, 3 port solenoid and tune are the best bang for buck go fast mods for a new subaru.
2. Blow off valves are unnecessary, your stock one can do the job just fine. If you want sound go for a hybrid model that still circulates back through intake and doesn't vent entirely to atmosphere.
3. 20" wheels in a pink/black colour scheme will look horrific and ruin your car. 18x8.5 wheels in the correct offset for you car will make for a nicer and more practical fit.
4. Keep the wing