After 2 minutes of photoshop I think this is way better now :
Layer Multiplication,Gradiation curve, brightness, contrast, hue and balancing.
now try tweaking your carpaint material (more glossyness maybe some fresnel) and you should get a really nice result.
Try reducing the amount of reflection of the Hdri map on the carpaint and glass to avoid overbright effects like now on the windscreen.
I dunno, I kind of like the original better. Its got a certain style to it that makes it look like it belongs on a t-shirt or something. More vintage looking