Suspension: Drop it with some sick rims. FSTB + RSB for the heck of it. X-drilled rotors and SS lines.
Engine: Install a chrome CAI. Take the manifold off and polish it. Clean the engine compartment and either replace all hoses with braided or use some nice split-loom for dressup. Turbo would be nice
Interior: Custom stereo system with home entertainment system. Fiberglass trunk enclosure, etc. Leather interior if it is cloth now. Dark window tint.
Exterior: Sick paint job. Clear lenses (no altezza please). New grille (intercooler if you turbo :ylsuper ).