What metal do you use to make a dry sump for a street car? Also do you need to have anything inside of it or it can be an empty tank?

 

i've seen them made out of aluminum.

 

They are made of 6061 aluminum. There is a TON of work that goes into them. They are far from a simple cylinder tank. They are filled with tons of baffles and such that work together to give the best performance. Honestly, why would you consider a dry sump on a street car? Really pointless if you ask me. If your really worried about it...knife edge the crank and be done with it.
Kyle