i'll do a short list for now, and add to it as i remember lol.
*Shot in RAW, when imported into photoshop, changed the lightsource to Auto, to get rid of the blue hue. also played with the brightness, contrast and clarity.
*duplicated the layer, and used layer mask to just show the outter "archway", played with the brightness & contrast, and i think i changed the blend mode to darken (or multiply)
*found a nighttime backdrop via google, and chopped it into the background, duplicated and flipped vertical and changed the blend mode to change the lighting on the ceiling.
*adjusted the asphalt via curves, and added another layer to the left of the car to adjust for the harsh light coming in.
*i believe the car is made up of 2 different renditions of the original image, which i reimported the original RAW image, and messed with the settings until i liked it.
*added the blue lighting to the drivers side of the car, and cleaned up some of the highlights around the edge of the car via the burn tool
*brought in a 3rd rendition of the windshield and spent a crapload of time getting that to where i was happy with it
*and then i resized it, bordered it, and stamped it
there were probably many other things i tried and undid or partially undid, but thats what i remember