Do you guys know any...?

Do you guys know of any free software out their that let's you totaly rebuild an engine and detail your can and then you get to race it and tune it and stuff? Im not talking about an arcade game that i would go on a mini game site to find im talking about a really in depth car game.

wel the closest thing i've seen to that was street legal racing, but it was kinda shitty, but you really could take apart the entire car, thats about the closest i've seen to that.