Cadillac’s Chief Engineer, David Leone, takes us on a deep technical review of the 420 HP Twin Turbo Cadillac CTS V Sport – everything from getting more from the 3.6 V6 to the use of specific lightweight materials in construction. This is more than just a tech overview of a car, but the logic of how to build a driver’s car as David explains not just what they did but why they did it . . .