I agree about the kink; it looks like a kink...
I also think that anyone buying an upgraded, aftermarket header is bound to be using an aftermarket muffler. There would be no point in upgrading the header only to install a big fat factory cannon muffler on the other end.
Having said that though, it would also be hard to decide how to change the angle of the exhaust so that it would work with the widest variety of muffler options. Some of those would surely need some sort of adapter anyway, no matter how straight Lancer makes his header.
Right?
Of course, if the header is a normal single wall pipe, I imagine you could probably bend it very gradually, or have it bent slightly as Lancer is suggesting to accommodate whatever muff you're using and get a straight looking pipe from it...
I know I'll be looking at those down the line, Lancer. Let me know when you get them ready!!