Approaching an 85-mph corner at 150 mph, I’m glad my stomach is calm and my bladder is empty. The Audi R8 GT4 race car has a surprising number of nooks and crannies to hold and hide any substances that may escape my body, and my brain has enough to think about already without working a hefty cleaning bill into my finances. I need all the mental bandwidth I can get because I’m tearing around the 24 turns of Southern California’s Thermal Club circuit.

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