Search for an SR20DET. Also,
G20.net (LINK) has a lot of info, but please, don't just make a thread that sounds like the one you just made. Search first, or else no one's gonna respond. There's even a "sticky" in the engine forum on there that will tell you info, but, if you just make a thread asking "where can I get a turbo" they're not gonna be too helpful because that question gets asked like, 50 times a day, and people are tired of answering! ha ha! so search G20.net, learn, see what options sound the best for your prefrence, then ask educated questions...
Hope this helps bro...
