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Here's another very interesting test. The older-style hood looks a lot dirtier aerodynamically, and it is. Compared to the smoother orange hood in the previous photos, it requires an extra 5.7 horsepower to push the car to 140 mph, but-and this is a big but-it pushed 13 percent more air through the air cleaner and into the engine. Now that the team has this information, it will use a track test to determine if the extra air to the engine can overcome the aerodynamic drag. In the future, however, you can probably expect Brown & Miller Motorsports to develop a hood that melds the best aspects of the two together.