A 1996 model is rather old and it is equipped with a 2.5 L inline 4 engine driving the front wheels. As previous posters have suggested, a sensible way to go about this is do regular maintenance, hand wash / paint protection (wax, glass coating, and/or etc), and keep the "performance improvements" less intrusive (ie. tinkering around the edges).
If I were you, I would just keep a 1996 Altima clean with proper hand wash and glass coating while saving money for a performance car (such as the Nissan Z, the Infiniti G, and etc).