My god you people all need help
We can obviously conclude that he meant RB25DET , he already stated that he had bad english so I assume he obviously can't type very well.
To answer your question yes, you can always go bigger turbo on the Nissan 25DET. But I would'nt suggest going bigger turbo unless you have other upgrades to support the better turbo(i.e. modified fuel system, higher flowing exhaus, exaust headers etc..)
I think the 25DET's come with a T25 turbo stock. Sure you can go bigger and these sites will help you acheive you goal