Create an adjustment layer after converting to LAB mode by clicking the half-filled circle icon at the bottom of the layers palette and choose Curves.

LAB color is made up of three components/channels: L, A, and surprise! B. The lightness channel L carries all of the contrast while the color channels A (green-red) and B (blue-yellow) carry… well, the color. LAB keeps color and contrast isolated from each other, so adjusting the curves of one will not affect the other. Although a simple color shift can be done using a simple method such as HUE, major color shifts going from one side of the color wheel to the other can benefit from the power of LAB.

When a big color shift is made in the RGB colorspace using HUE, you can see where highlight/shadow detail is lost and compression artifacts start to show up from the lighter channels.
Convert your image to the LAB colorspace by going to Image: Mode: Lab Color.

Creating a certain color other than its opposite requires a bit of practice writing curves, so in this case we are just going to turn it upside down on both the A and B channels. Do this on the A channel by dragging the bottom-left point to the top-left, and drag the top-right point to the bottom-right. Repeat for the B channel. Leave the L channel untouched unless you wish to write a curve boosting the contrast. See the tips on The Color Wheel

So the color on the car looks great, but what about the rest of the picture? And how come when you apply an effect to a layer, it’s called Blending Options?

Control/Apple-Click the adjustment layer and choose Blending Options from the context menu. If you are anything like me, you completely ignore the first screen that pops up and immediately click on an effect. Look at that bottom box that says Blend If. Change the channel to A and set the blending range to my example. Split the arrows apart by option/alt-click-dragging them. This basically blends the top color to the bottom color in the range we set. Play around with the sliders, you will see it in action.

Also you can play around with the color using the Opacity setting of the layer. Have Fun!