Yaris is shacking

[adigilani]

have checked most of the stuff mentioned here all looked fine to me but i have decided to put a service on the vehicle after the petrol tank is empty. However i did use a petrol additive once in the last tank just so i can clear up the fuel lines and pump and after that the shake i was experiencing has gone completely and the performance is way better.

Thanks everyone.

However now i am looking to get tutorial on how to install new speakers in the back. My yaris doesn't have any back speakers. It has two in front doors and two on the dash board on each side. The sound isn't great. So i was hoping if someone can tell what is the size of the speakers i already have in yaris. They are factory ones.