There is no markings on the outside to tell you what it is. Only markings on the compressor housing tell you what it should be.... But people change the outside
You have
Single flapper 9.0 .. 4
Twin flapper10.5 .. 5/6
Single flapper 9.8 .. 7/8
Single flapper 10.5 .. 8mr
Then the evo 9 turbo