Those dimensions in the picture are wrong.
For it to be an 85 trim, the wheel diameter on the outside of the turbine has to be 87mm not 85mm as it states. If the wheel were 85mm it would make it an 89 trim.
So...if the wheel diameter is, in fact, 87mm as I suspect, then this is just a polished GT4508R
Compressor map is
http://www.turbobygarrett.com/turbobygarre..._Comp_large.gif