* Porsche schedules 8 days of production stops at main plant
* Volkswagen may stop production in Wolfsburg for 3 weeks
* Audi says production halts are a precaution
* BMW says will cut further 400 temporary jobs in Leipzig
* Porsche shares down 8.8 pct, VW down 17.7 pct
(Adds Audi production stops, BMW temporary job cuts)
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