Types of core you would use on ZhanChi

Core changes?

I have a Zhanchi and a Guhong, and I heard of people who switched their cores out.
And i was wondering what cores you switched to.
So if anyone could tell me if i should switch the cores, and if so which core to switch to.

P.s. I wanna buy 2 more guhongs, maru llube, and stickers,
anyone have any ideas where to buy?
 
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