According to the article, the new Ultimate Series car will use the Monocage II carbon fiber tub, which made its debut in the 720S, but power is said to come from a modified 3.8 - liter twin - turbocharged V - 8 from the 570S, 675LT, and previous P1. (automobilemag.com)
According to Alfa engineers, the 4C's exotic (read: expensive) pre-preg carbon fiber tub is where nearly all of the car's rigidity comes from. (automobilemag.com)
Looking for a lightweight carbon fiber tub, prescient steering, sublime handling, and brick wall braking — in other words, a thinly disguised racing machine? (autobytel.com)