Brake ducts. I haven't done it yet because I like my stock look with the fog lights.
The carbotechs are really great for the track. You CAN use them on the street, I do, but they dust like crazy and squeal. No noise when they get some heat in them. A reason lots of people give for NOT using them is cost and longevity. They're more than other options and wear out quickly. If cost is a concern you should look at some other options. I can't help you with which ones. Surf the road race forums for reviews.

Les

When looking for reviews or info check cars that weigh more or less the same as ours. I check what Corvette racers use or even Mustangs and big BMW's. Be aware of tire sizes because it all makes a difference. Also street tire vs. R-comp. What works on a light car may not be right for a heavy car, as well as street vs. race. Justin switched from Carbotech to Cobalt pads. It could be a sponsor thing or they're just better.