Looking for NFS 2, NFS5

yes you can download it from torrent sites

You can find so many versions of Need for Speed almost anywhere on the web. The old NFS I think was first seen on the Playstation 1 console, If I'm not mistaken. I cannot remember if there is a Sega Genesis NFs or a Nintendo Entertainment System version of the old one. You can check out eBay for cheap game cd's of the game. Also if you are into emulators, you can checkout Freeroms.com or PSPIsoz.com. Most of those Need for Speed versions you are looking for is available as a downloadable content, it is up to you to get what version be for your console. I can still remember the old NFS on the Playstation 1, wherein the cars are digitally made like the Ferrari and some other cars. Gameplay is straight racing on the road and there are occasional cop chases if my memory is correct. Anyway, those are just some of the sites you can checkout, I hope you will be able to find what version you are looking for, have fun.

you plan on playing this using an emulator? there are alot of sites out there that offers free download for games in all console try searching some.