Dual exhaust - h pipe will give you a sexy loud low rumble x pipe will give you a more raspy sound but higher horses
Gears - 3.73 and 4.10 are recommended but if you need MPG use 3.73
Performance shifter - if you have manual
Weight distribution - If you really want to go all out you could remove some weight from the car (ie rear seat delete)
Cold air intake - get plastic not metal because it heats up faster, this is the first thing I recommend it makes a drastic difference to your car
Suspension/shocks - improve handling
Springs/lower - improve handling
It just takes time and money for performance parts.
2006 JetWolf Gilbert, AZ. Come race me, I dare you. ASU!