So, Naruto Shippuuden 169 was leaked and weird thing is God Pein felt pain and busted out screaming when Naruto hit him with a Rasengan. o-o
When Ibiki was torturing Animal Realm, she felt nothing. Weird....
It has not yet been subbed.
EDIT: It has been subbed and this site is currently hosting it. I recommend that you use Narutobase as it is available