Soflo stack?

2001cummins

Costly
I sold my dual stacks and y pipe. I have been looking and I see that you can pick the inlet size 4"or 5". But can't find if it's outside or inside diameter. The y pipe Willis over my 90 so would I need a id on the stack?
 
I have ordered one and was wondering how long it takes to receive it? Been a week now and the status has been the same.
 
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