Porsche presented the all-wheel-drive all weather open-top 911 Targa at the Detroit auto show. WSJ's Matthew Curtin reports from the 2014 North American International Auto show in Detroit. Complete 2014 Detroit Auto Show coverage HERE: bit.ly/1cWuxVv Click here to subscribe to our channel: bit.ly/14Q81Xy Visit us on Facebook: www.facebook.com/wsjlive Follow us on Twitter: twitter.com/WSJLive Visit the Wall Street Journal: www.wsj.com