I believe what he means is that you are supposed to use the search function to see if there are any existing threads concerning the topic you are looking for and in this case there is an existing thread on the topic of MIUI for our S2 Plus which can be found right here
Now please no more arguing.
There are people interested in doing this but as has been pointed out it's not just a matter of plug and play unfortunately. The S2 Plus hardware doesn't seem very compatible with any other devices which makes it a lot harder to port or build a ROM. Hope that helps!