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1987 944 Turbo Windshield wiper skipping

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Vehicle Information: Model(924/944/968): 944 Turbo; Year: 1987; Body Type: Coupe; Total Mileage: 72,000;

Last August I was driving on Pocono North in the rain at a DE event. At about 80 mph the driver's side windshield wiper began to skip. I pitted in, switched the blade with the passenger side, and went back out. It still skipped. Wondering why this was, I looked at the wiper design on a 996 GT3 and noticed that the driver's wiper has a 'wing' that appears to be for downforce. Why does this apparent lack of wiper downforce at speed only pose an issue on the driver's side? When did Porsche realize this and does the 'wing' on new Porsche driver's side wipers solve this issue?

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