I made 2 of these for a friend for a replica of the 1984 Sport Quattro. It gives the engine bay the correct look instead of a welded pipe or other strange looking solutions.. This pipe belongs to the road version of the Sport Quattro. You can see the part at the left side: here https://12v.org/urs/SportQEngineBay1.jpg
The pure rally versions having a different intake system mostly build out of carbon or kevlar fibre.
The pipe is only 4mm thick and I was not sure i could cast a thin part like this but all came out well.
Creality 3D® Ender-3 Pro: http://bit.ly/2VXZMP6
Creality 3D® CR-10: http://bit.ly/2WGWlJI