Can Naruto go above 4/5 tails?

[Narutoftw]

I think there would be like a giant inner battle between them and they would both end up dead. Or Naruto comes out of it in critical condition and Tsunade/Sakura would have to heal him.

 

[sandshark]

He can go all the way to nine tails. And btw both halves of the Kyuubi chakra is sealed in him. There's a thread somewhere on it.

 

[Narutoftw]

i've just been reading about it and yes both halves are sealed in Naruto.. But the yin side of it is apparently inaccessible to him.. would the toad key which was able to "twist" the seal to release more of the yin be able to open it so far the yang would be released?