There is a reason that every car that leaves the factory is hand made and that is so that all the parts can be fettled individually and be made to fit, whether they fit or not, they WILL FIT.
I agree with respect to the length of the front part of the pipe - it's possible this could have been sorted with some adjustment of the header pipe - although it was so far out maybe not.
However, there were no mounts for the heat shield and the mounting brackets would not allow the threaded part of the bobbin to fit. Neither of these come under "fettling" in my book.
