The wing is definitely functional and you WILL notice if you remove it. Not that it's a bad thing, I have mine removed, also for stealth reasons. But the rear end definitely gets floaty without it. You can tune out some of that with suspension mods, but that's a whole 'nother story. :lol:
Anyways, welcome to the community! I'm sure you will like it here. There's a ton of good information and lots of helpful people to point you in the right direction. Don't be afraid to ask questions, even if they seem simple. We are not like some of the other forums where you might get shit on for "being a noob". This is most friendly and civil forum I've ever seen. Once again, welcome! :subaru: