I was looking around the internet and I came across Energy Suspension Universal Endlink Bushings part#ENS-9-8122R I've heard from a few of my friends that this part will make my handling better, is this true? how so? and has anybody else installed these in their xA? how long did it take, and most importantly is there any DIY instructions laying around scattered in Scion Life?

 

they make it stiffer cause they are polyurethane bushings.

 

Yes they will help make you handling a bit better. I'd say they are worth the like $20-some odd bucks and the time. Like "dexter_5000" said they help stiffen things up down there.
Check out these threads, if you haven't:
https://www.scionlife.com/forums/viewtopic.php?t=78651
https://www.scionlife.com/forums/viewtopic.php?t=26437

Those should be what your looking for.