A convertible version of Porsche's 911 Turbo has been caught undergoing secret testing. Our footage serves as evidence that Porsche is intent on taking on the fastest convertible on the road, Ferrari's F360 Modena. The distinctive large front headlamps, deep airdam and intake and side air-scoops emphasize the sporty intentions of the Turbo model. Unique 18-inch alloy wheels and fixed whale-tail add further appeal.