those are all stock sti parts that wrx users can buy and put on their car. Post a thread on your local chapter and ask someone to trade their stock black hood scoop for your sti one. You'll get someone to jump on that QUICK. Also, if you want to get rid of the sti wing do the same thing. Ask someone to trade you for their wingless trunk.
The sti splitters you're talking about (under the fogs) come off very easily and you could sell those for $75+ (depending on condition)