well bud, the first question is did you read a thread at the very top that titles:
The Official Type R Thread
it has 2664 replies
and if you did, you'd realize just how they sound, within 2664 replies, if there isn't a single post on how they sound, may god strike me dead with a lighting strike...
as far as power goes, if you read the post, you'd see that depending on if you got a dvc 2 ohm or 4 ohm, then that will determind if you need a amp that is 1 ohm stable or 2 ohm stable...and if you read the post, you'd see that they can take anywhere from 500 rms up to 1000rms if you know what you are doing