I just got my header and Y-pipe back from the powder coater and I wanted a sanity check on something.
I've noticed a few 919 headers that had a bit of a flat spot on the rear slip-on flange, making it slightly D-shaped. The one I sent to have coated had this as well. Is this normal for the stock header? Pics are clickable for higher resolution versions.
Just a guess but i wonder if a Y tube not quite fully home in association with over tightening the clamp band might do it.
if so, the flat spot would be a function of the orientation of the band's tightening bolt is.