How to ID a Turbo

[TurboTdr3.8]

I would like to know how to tell what kind of turbo I have , I bought this car used and the owner said it has a GT70P Turbo, All I can tell it has 4in inlet and 2.5 in outlet and a wastegate in the downpipe and its a 3 bolt version and can not find no markings on it nowhere but percison on the exhaust housing , can someone tell me how to tell what I have for sure .

 

[TT/Ameasap]

Pull the covers and measure the wheels with calipers