Custom built 66/74/18

Looks to me like a .91 housing....

i'm still learning about turbos so be easy with me but what is the major difference between .91 and .9? does it somehow affect flow in a big way? also how does this turbo compare to a silver 66? better? worse?
 
i'm still learning about turbos so be easy with me but what is the major difference between .91 and .9? does it somehow affect flow in a big way? also how does this turbo compare to a silver 66? better? worse?

This is a larger turbo than a silver 66, this is a t4 turbo and a silver 66 is a t3. If you got the fueling to light this turbo its way better than the silver 66
 
New in box HTT S400. 74mm compressor. Not sure on the rest of the dimensions. If u pm me ur number I can send pics.
 
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