Being able to blow your engine would be a good addition, the oil idea is good as well;, it all adds to the realism. I think you should be able to put a turbo in any car as well and maybe choose different turbo configurations like single turbo, twin turbo and quad turbo systems, each with different sizes turb to choose from, so you could have a S2000 with a medium twin turbo system or a large single turbo configuration (or whatever the technical term would be for that) etc.