New Ferrari chief: We can't 'screw up' car's DNA By: CNBC.com News October 13, 2014 at 10:54 AM EDT Sergio Marchionne says he is committed to preserving Ferrari's legacy, quality and racing prestige. Read More >> Related Stocks: Fiat Chrysler Automobiles N.V. Porsche Auto ADR Volkswagen Ag Pfd Sh