Great idea, smooth and simple design. Rims seem to be a good match for the car as well.
As far is the body kit, it looks very toony. You need to add some reflections similar what was on the car to make it feel a little more realistic.
On the note of reflections, the one on the windshield seems to be a great match for the new bg, but it it a little strong. Need to turn down the opacity a little so the windshield doesn't seem so much like a mirror. I would say the same for the side windows, unless a mirror reflection is what you were going for.
Keep at it
