New valve springs, or just shims... up barely north of 200 hp we run into valve float with the stock springs.
Armrest fix that allows height adjustment, or else a substitute that fits into the rear cup holder or something... at any rate, one that doesn't suck unless you just happen to have the correct elbow-above-asterisk distance.
Driver selectable CAI/WAI
Louvered grill
Full belly plate
Replacement seats; lightweight "race" set, fold flat "Fit style" passenger seat. Pushbutton removable seats.
Race harness
Roll cage
Streamlined headlight caps
Selectable exhaust/no exhaust system (illegal in PA, who knows about your state)
RS style steering reprogramming (available now if you can scam your dealer into doing it... but most won't)
Just off the top of my head. Doubtless tons more stuff we'd love to see, keep 'em coming!