what size hex for this plug

[yosvany]

jus wondering what size hex it takes

 

[97gst_spyder]

Chinese... Looks like a special proprietary one.

 

[agentorange313]

Its hard to estimate from this picture but I would say

9/64, 1/8, 7/64

where did the turbo come from? If its a MHI turbo with that fitting it might e a Metric size allen key.

If I were you, I would just get a standard set of allen keys and see what size fits, you will need a set in the future if you plan on working on you car much.

goodluck