Firstly, Nightkids my decision changed again.

Ok updates guys!
I went out and bought a pair of splits from FLi Audio and had fun with 2 friends DIYing and loved figuring what to do with minimal tools. (Currently connections wrapped in insulation tape only ;D ) To my surprise. . .i found out something interesting. The stock speakers i "assumed" are actually aftermarket speakers. . . There was pair of 30w pioneer in the front and some sony ones in the back. After removing the front speakers all the sudden the back speakers became much more louder and the bass level was increased as well for some unknown reason. . My new speakers did provide provide much more bass compared to the ones before but still not the level i was expecting because of 2 things. Properly the head unit is old and i can not set the rear speakers to be less quieter as they louder than the front and covers up the front speaker and i realized most new cars has sound deadening done from factory so thats why my mazda 2 packed soo much bass with the stock speakers so might be attempting some sound deadening. To be honest i had no idea sound deadening could do so much difference until today and was actually bit lost when you guys mentions about it but now i see what i maybe able to achieve with it but because the original 300dollars was originally planned for headunit + new speaker and my budget isn't as high before im trying to find alternative to dynamat.

Thanks for the replies though guys, Learning alot so lots of thanks from me.