Originally Posted by UCrewX5

6 speed tranny versus the 5 speed on pre-04's, face lifted front end (different hood, grill, bumper cover, fenders), some different interior and exterior colors.

If you have navigation then the 01 has the CD-based nav drive (MkIII) and the 05 will have the DVD based nav drive (MkIV). Also, if the 01 was built before April 2001 then it would have the 4:3 screen instead of the newer 16:9 screen.

Also the 01 didn't have adjustable ride height, automatic headlights, wasn't Siruis ready and wan't AUX capable.

I'm sure there's a few more I'm missing, but that's what I can think of off the top of my head.