Crank pulley's for Yaris?

[ToTo]

Originally Posted by PetersRedYaris

People debate this all the time. Some say don't install one while others say it won't hurt anything. If you search you'll find info on this.

I've searched and found many mixed views and opinions on this... I just dont know the real deal? I ordered one, hasn't arrived yet, most likely next week, just wanted to know some more direct info on this.

What can it actually hurt? Can it break as mentioned? I know a lot of people have this installed on their cars, Yaris as well. I've just never heard of anything going wrong by installing this mod.

Opinions and feedback?