Aero had a difference in Barcelona if one is to believe to EKS. Ekström had the bigger wing at first but changed it to a smaller one and didn't change back. Nitiss and Heikkinen however had the bigger wing all weekend.
The boxed wheel arches are getting quite regular so aero has definitely increased in importance. According to a close friend of mine aero can make a difference already at 60 kph.
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