A trunk that provides a bit of aerodynamic support in the midst of one giant drift is a clever invention even if it wasn't the result of engineering foresight but just extreme G-forces combined with forgetfulness. Not sure it does anything, but it's a great trick. (Hat tip to CeRuLeaNBLu!)
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Why do professional drifters remove the front ends of their cars? I've seen that in other videos as well.