Suggestion: URD MAF Calibrator, aFe Momentum GT CAI, URD Y-pipe, and a side-exit cat-back of your choice. This will get you a more peppy drive, and more free-flowing exhaust.
Headers aren't worth the frustration. If you want more serious power, look into the superchargers available (Magnuson, URD, or Procharger).
You can do just the exhaust, but the intake really could use some help. Instead of the CAI & MAF Calibrator could try the Sprint Booster or something of the sort. I found the CAI & MAF Calibrator combined with 91+ octane and the exhaust gave better performance and mpg by leaning out the AFR more towards peak (14.7) than OEM.
FWIW, I ended up with the URD SC kit though.