But pay attention, it isn't a perfect reflection, it has "mistakes", do you know why? Because he isn't using a reflection plane, he is using HDRI, look at his wheel reflection, and if you have a reflection on your windows, you don't need to have the same reflection on the car paint, because the reflection depends on the car paint, like, if it is a matte paint, you won't have reflections as if you have metallic paint.
My VWS outdoor scene with the lastest wheel made by me, almost the same as Mogster. I was thinking in doing it a long time ago, but as Mogster did, I got motivation and I did it too.
A little tweak with Photoshop.