Two very simple and In My Opinion the two most logical. CAI (cold air intake) I went the Ganzflow bc I have the MAP vs MAF. Second new rear sway bar. I am waiting on Ralispec to UPS my Whiteline 18-22mm Adj. (C'mon UPS!)
With these 2 mods you get some increase in HP and better handling. Also using these as your first steps will not hamper any thing elese you do in the futre, umm that is unless you go turbo, then the CAI gets thrown out.
After that most here would recomend being able to turn fast and stop fast before you worry too much about actually going fast.
KYB adj struts with Whiteline springs and then Stainless steel brake lines with new pads.
Good Luck
TIm