Hello welcome, great 21st prezzie, it all depends on how much you want to spend on mods, be a n/a car there's not a great deal of work you can do without spending a lot of money, maybe an air filter and with the exhaust you'll be restricted by the equal length headers to release in the boxer sound, so you could go cat back exhaust but it won't sound exactly like a turbo,
I'd go for handling and lightness as you still have a very potent car so maybe look at upgrading the suspension components make it turn in and get the power down better.
Anyway welcome and get some pictures up when you've bought her