Identify Hotshot G3 and G4 headers?

[Jay Stewart]

I just got my primary back from Hotshot. To be honest it looks like they
sent me a different part, the runners look a little bigger than I
remember and the flange now says "hotshot" on it whereas mine did not
before (that I remember anyway). What I sent was a G3 header, and I
think this may be a G4. How do I tell for sure? Did the G3's have a
"hotshot' imprint on the flange? Anyone know the OD of the runners in
the primary?

I'm not complaining, just want to see what I had.

Thanks,
Jay