I know little to nothing about where to start buying performance/racing parts for cars. Where can I learn where to start, and get a brief summary of what everything does? I want to start up'ing the performance on my car piece by piece, not all-at-once. However, nowhere do I see on any parts site what I will want or need. There are 'Staged Upgrades' for MazdaSpeed3's @mazdaspeedstore.com/ but this is for MazdaSpeed3 and not Mazda3. I don't know how much of a difference there is between them and also these parts are meant for 2007-2010 so I don't know if they'll fit. Would I be able to simply buy the 'Staged Upgrades', or is there something I need to make my car a 'MazdaSpeed3' first?