Hi buttercatz,
We're not up to five yet on our 2003, but have done 1) K & N cold air intake, 2) Flowmaster Series 40 cat back dual exhausts, 3) intalled a GT rear body panel for the dual exhausts to exit properly, 4) SPEC Stage 2 clutch kit and steel flywheel and 5) Hurst short throw billet shifter - Hey that's five I guess! Next, some underdrive pulleys, then some cosmetic stuff - fog lights, new pedals, etc. So far, with the exception of the Hurst Shifter, we're pleased with the suttle performance increase, the sound, and the clutch which allows us to drive the vehicle more aggressively - the original clutch was disappointing and didn't make it to the 30,000 check with only about 10,000 miles of the after market mods on it. The shifter looks nice and feels nice, but is much noisier than the origina Ford shifter. Methinks it's about to go "bye-bye".