Just a few questions from a newbie
 

Hello there, I am new on the forum and never had a Mazda before so my first question is why the fuel injectors two are green and two purple also I went today to get a fuel filter but in the auto parts they told me that the only filter is in the tank, I would like to know if there is something that I should be aware of. My ride is a 2002 Protege5 . Thanks in advance.