i hear ya but i don't think it would have taken anything away from the focus of the picture, inversely, it catches my eye that the mirror is clipped off from an artistic standpoint. i shot a similar pic of a 370 nismo last year, i'll post it up in a min so you can see what i'm talking about
this is my prefered angle of view:
http://jpmcgphotography.smugmug.com/...88411225_xfGLJ
different strokes for different folks tho so do what you like