First welcome to the forums. There are so many threads dedicated to this very question so my recommendation to you is to look around the mazda 3 section and read some of them. I think if you take the time to do that then you will learn a whole lot more and enjoy your time spent here.
(2thumbs)
where are you located ali said? i know not much is avialable from our USA vendors that can be put onto the 1.6l as far as power goes. I would check in the international forum or perhaps a car forum in your own country.
The only way your going to make that 1.6L fast is by slapping a turbo on it. Any NA mod you will do will more then likely only make noise and make your pocket lighter.