https://www.cnet.com/roadshow/news/ford-3d-printed-manifold-ken-block-hoonitruck/

Thus, Ford Performance came to the rescue. Working with Ford's own engineers in Europe, as well as RWTH Aachen University in Germany, the team designed and 3D-printed an aluminum intake manifold that could handle the required volume of air. Ford claims it's the largest 3D-printed metal part ever installed on a functioning vehicle.

While 3D printing has been working its way into the industry mostly via plastic, 3D-printing metal objects is gaining popularity, too. BMW has already invested in the tech, and Bugatti used it to build a gnarly titanium brake caliper. HRE, an aftermarket wheel company, used 3D printing to assemble some of the wildest wheels I've ever seen, too.