I'm new to these forums. I'm 16, I own a 2009 cx-7. I am getting into the customizing of my car slowly and surely. I will post a picture of it soon.I do need some help, I am going to start under the hood first. I already have a K&N air filter, I have around $200 to start on the mods. What can I do first that will help my performace and mileage? Any help would be greatly appreciated, I have seen some amazing stuff from you guys.