"u think you can give your type-r 12's 850 rms per sub." what exactly is making you "think" this. they may be able to take it for a lil while, but remember your giving them almost double their rms, and unless you know for sure that sub can take well beyond its rms, you may end up ruining your subs. also, "is it possible and can you help me"?? like the post before this, anything is possible, and its just a bigger amp, nothing different that you have to do compared with what your currently running, besides possibly upgrading your wiring and alt if its too much power for your car to handle. otherwise, good luck.
why would go go and buy some expensive amp that puts out 850 rms pre channel and get some good subs why not just save ur money for a little bit and get 2 really good jl audios or somehting that will hold up to 850 rms.