Yeah, I looked more closely at Red Faction: Guerilla. From what I can see, they've made tons of pre-broken parts that everything can be replaced with.
It is, yet again, cheating. It's just done all the way through making it appear much better.
Even DMM cheats, the trick is just to cheat really well when it comes to these things.
Red Faction: Guerilla is probably the most convincing one out there at the moment though ^^