need help 2 identify my turbo

[buickbert]

i though it was a stock turbo but when i was cleaning it up, where the turbo bolts to the pass header it has the markings A/R .63
M3
G2

and where theturbo flows into the intercooler it has A/R .60
M10

if anyone has any idea what these mean please let me know.

thx
buickbert