This is an honest question...
Does your car look a little pink in the flesh?
I've got a GTI in tornado red and when I take pictures of it with my Canon D450 it comes out with a pink tinge that isn't that noticeable in real-life.
Is it the same on your D40?
I've got Jeffs Werkstat Acrylic kit on it at the moment. Apart from resizing and blanking the number plate here is an unedited photo on auto white balance.