stock plugs, stock coil, svt header with egr bung (if you want to keep your egr system)
,larger flex pipe, larger exhaust 2.25", svt air box and snorkel, svt suspension, summer performance tires. If it is a manual transmission, get a short throw shifter. You could upgrade your front brake pads. If it were me the one thing I would do for sure is the svt suspension.