| Because otherwise it looks stupid. The enthusiasts companion says "Toshio Yamashita worked closely with wind tunnel specialist ... It became clear however that the faster turbo model would need a deeper front apron and a tail spoiler, even if these increased drag." On page 20 there is a pic that shows the airflow over the car and though the car in the pic in the wind tunnel does not have a rear spoiler on it, the spoiler would be in the airflow.
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