Get better tires. That's the best way to make anything faster. It will brake harder and corner harder, as well as be safer (more grip to stop or make quick lane changes should you need to).
I prefer Michelins. They make a really, really good tire in the Pilot Super Sport - lots of feedback (audible and steering), nice and predictable, great wet weather performance.
Other things like strut tower braces and various bushing components will also make the car feel much better to drive.
Like most others have said, bolt on parts for the V6 are few and far between. Maybe an air filter? ECU job? You're not going to find many superchargers for it.