Here you go
http://www.sonicperformance.com.au/G...l#_739548_5001

Looks to be a GT2860R or the "disco potato."
The part number on it says it should be the RS which is internally gated but yours seems to be external which would be the R and end in 5010.

Edit...Dammit i was beat.

Either way, it's a ball bearing turbo. Which is why its water cooled.

Oh and you have a broken stud in the exhaust flange.