That's just the cowling to smooth the air around the exhaust exit. It will still have to point upwards.
BUT...
That cowling will pull air down around the exhaust, which should push the exhaust stream down the faster the car goes, which SHOULD help blow the diffuser.
So RBR are going for the blown diffuser instead of the blown rear wing.
This will be interesting. I wonder which solution will prove superior? I'm a fan of blowing under the rear wing at high speed to eke out a speed advantage, instead of the minimal benefits of a passive blown diffuser.





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