I have my own “Offering to the god of speed” wall. I try to keep it to parts that I have personally broken, or have been broken by/come off a broken car/assembly of a friend, but there’s a couple non broken parts up there.

If they’re just old worn out replaced parts without a story, they get thrown out or recycled respectively.

Edit: I’ve also got a couple of engine blocks that I want to make some tables out of.