agreed the pic of you and the car
i would start with intake then there are lots
strut tower brace, gtr exhaust, hids headlights, tinted tail lights, those are just a few ideas for not all performance but handling and appearance.
Pontac G6 Sedan 3.5L
Exterior- 8000k HIDS lows, 8000k HIDs fog lights, 20% window tint, Tinted taillights, painted grilles (top and bottom) to match, Custom painted engine cover and battery box, Red painted calipers.
Performance- Crab Intake, Racing Line Performance strut tower brace, GT-R Custom Magnaflow exhaust.
Interior- red LED's on inside, custom painted interior trim to match outside, Memphis sub and Amp, Custom fiberglass sub enclosure.