Engineer Victor Martinez says that toward the end 2014, Ford Performance began to design an intake manifold, and it led them to 3D printed several intakes and test them. The result was the most advanced intake yet printed, and in combination with carbon fiber plenums, the manifold was used for the No. 02 Target Ford EcoBoost-Riley race car. Martinez says the performance of the final prototype manifold so far exceeded his team's expectations they decided to use it for the race. It was so good, in fact, that it helped Chip Ganassi Racing, with drivers Scott Dixon, Kyle Larson, Jamie McMurray, and Tony Kanaan at the wheel, win the Daytona classic. You can read the whole story here: http://3dprint.com/69233/ford-24-hours-of-daytona/
Below is a photo of the winning car in the 24 Hours of Daytona, powered by a Ford EcoBoost engine featuring a 3D printed intake setup: