Just thought of this idea while watching videos of the Rally 1/10 due to the spoiler on the back/top of it. I have seen one guy on here with a drag chute, but how effective would an air brake be on our car in place of a drag chute? You wouldn't have to repack the chute and since the XO-1 is the Veyron of R/C cars, why not have a brake like a Veyron?!
Just in case you don't know what the air brake on the Veyron looks like: