Motorsport.com:
Meanwhile, the changes made to the monkey seat enabled McLaren to maximise its operation in relation to the diffuser and rear wing.
The support was increased significantly in length, placing the winglet much further away from the exhaust plume, which it is looking to interact with.
The winglet itself was all new too, with a much more extreme curvature present in the central portion and trailing edge, whilst its predecessor had been much flatter.
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MCL32 and Mercedes W08 diffusers comparison