necking down after collecter?

The shop is an all around mechanic shop, not an exhaust only shop. I kindly mentioned it to him today and the "TTI" not "TCI" headers came with 3/8" flanges for the extensions/collectors to mate up with a gasket between. So I got him to cut a 3" pipe and weld it to the flange that would have held the 3" to 2" extensions/collectors. The inlet side of the extension/collector is 3" then it tapered down to 2". I think ya'll are right, he may have been trying to save time/cut a corner on it, but I got it straight with him so it will be 3" all the way... Thanks for all of your input.

I have dyslexia, that is how I got "TCI" and "TTI" mixed up. Oops! They are TTI 3 step headers, very nice ones. About $800 if I remember right. That is why red flags went flying when I saw that 2" section on there.