So starting with the 2004 model they changed several things, such as more torque, better suspension, etc. correct? So are the '04 and newer models significantly better than older ones (specifically '03s)?

 

yes.

 

The 2004 MY is a little easier to drive in traffic but 2000-2003 MYs had a 9k redline
I feel all MYs were great cars. The improvements were subtle....I had a 2001 for
5 yrs and now have an 06. They are different but, I feel, very much the same.

My suggestion is to use the search and read the forums.

 

Try running a search on AP1 vs AP2, and take a look at the sticky threads on this forum.

The topic has been discussed in numerous occassions. The word "better" may stir up some heated arguments here ... as that is largely subjective. Nevertheless, give it a shot and see what you come up with. You'll pretty much find every single thing that's changed throughout the model years.

Good luck!