i need to order up a vband set, i thought i needed 3" but now im 2nd guessing, the inside of the outlet measures just over 2.5" the outside lip (wide part ) of the outlet is a little over 3" the OD of the outlet inside of the lip is slightly over 2.75

its a non wastegated 16cm housing

 

get a 3" set and weld one of the 3"s straight to it

 

yes its 3".

 

thats what i did with the same problem, worked fine