What is this turbo??

[Built5.0]

We found this Garrett turbo sitting in my buddies garage and we cannot figure
out what it is. Here are the numbers that were stamped on it.

On the Intake side it reads: A/R .60 M10 RC 12037-2

On the Exaust side it reads: A.34 or 4.34??

It a pretty big turbo. From what he was told it came off a grand national.

Anyone know what this thing is??

 

[Intercooler]

Measure the wheels diameters in mm's. Take a blade count and compare on Gnttype.org.

 

[UNGN]

Could be a lot of turbos. The housing could be a from a GN, but its what's inside the housings that counts.

Here's a direct link to the Turbo Photo guides