how to measure a wastegate

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mazdaspeed protege
I have an external wastegate and im not sure what size it. I mesaure the outside of the first ring and its 35 i measure the outside of the second ring and its 42.
 

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what type of wastegate is it? perhaps there are some markings on it that you could use to figure it out? Otherwise, I'd say the inlet diameter is the size.
-Mateo
 
Where did you get it from?
Does it not say TIAL across the top of the wastegate?
 
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