Clean car for sure.
But I'd highly recommend not tinting the headlights, one for being semi illegal and the other is that light output is not really awesome to begin with. Tinting them will make night time driving worse and that's not a good idea. A slight tint to the tail lights to give them that smoked look is alright, many do that. Also wheel spacer at stock right height might look goofy because of the wheel to fender gap it's still going to have.
As for performance mods, there are many that you can do but the gains are always so small on the NA 3.8. Anything from an custom intake for sound (no power gain to had there) to exhaust work like a downpipe.
The biggest things you can do for maintaining the car is get it up to snuff right away. If it still has the factory intake gasket at 14 years old, those should be on the to do list. Factory coolant aswell needs to be gone for sure if it has it. Transmission fluid should be changed if original too, at this time it's worthwhile to install a shift kit to furth protect the transmission from a possible issue that they can suffer. (long shift codes)
