I just finished a very rough copy of a guide to get the most power of your N/A mazda3 most being VERY easy to do! I will be adding MUCH MUCH more guides/how-to's unfortunately its just 5 am and i work at 12 !!
Here it is:
http://uploading.com/files/859bem29/Mazda3-na-guide.pdf
Please give me feedback so i know if its worth while to keep adding to it!
*if anyone can recommend a better (FREE) place to upload files let me know*