Just purchased a 2004 Mazda 3 and I am loving it. It is fully loaded with everthing but leather and GPS. It is the 2.3L sport package and I am loving it. I traded my 2003.5 Mazda Speed Protege for the Mazda 3 and it was a good decision. Are there any good performance parts for the 3 yet?

2004 Mazda 3
Velocity Red
Sport Package

 

I've heard the CAI makes a pretty good difference (like 5-8hp or something). Also there are cat back systems available. There are some performance springs out there, and hiboost is coming up with a turbo kit for it in the near future. That's all I know of.