Was wonder which plug in and settings would I use to make colors (of cars) really POP and stand out? Thanks.

I've always found the 3-way color-corrector effect to do the job nicely. However, if I'm in a hurry, the Fast Color Corrector effect does a good job as well.

As for third-party plugins, I used to work with a color-corrector that came bundled with a Canopus DV-REx RT capture card/breakout box setup, and I found that to do a marginally better job than what Premiere gives you.

Sometimes, all it takes is a little boost to saturation and contrast, but I've learned that great color correction requires a fine touch. Hope this helps.

I personally don't own a copy - nor have I actually used it - but from what I've seen over at www.redgiantsoftware.com the Magic Bullet Looks product seems to be what you're looking for.