Did you make Raw files for the original shots?
If you didn't and made JPEG files instead, there is way less headroom for doing edits.
I would open all of the photos in Photoshop Camera Raw.
Make sure Camer aRaw is set to the ProphotoRGB color space, 300 ppi, and pixel dimensions that as close as possible match your cameras image pixel dimensions.
The first 6 of your photos need to have the exposure of the car normalized (correct the about 1/2 stop under exposure). If you use the Adjustment Brush you can edit just the car (local edit) and not the entire photo (global edit). However, it takes some practice and skill to use the Adjustment brush effectively.
The last 3 I would consign to the Recycle bin.
Back to Camera Raw.
By opening those 6 photos in Camera Raw you can edit just 1 of them and then sync the edits to the other 5.
In the Camera Raw Basic panel move the Clarity and Vibrance sliders to +30.
In the Sharpening panel set the Amount to +25, Radius to 1.0, Detail to 25, and Masking to 0.
You could then open the the photos in Photoshop for more advanced local edits by clicking on Open Image.