25 for door 40 for floors
and I am assuming peak power and thats into 2 ohm speakers so its less for 4 ohm speakers if you replace them.
http://www.e90post.com/forums/showthread.php?t=352586
look in this thread for details.
http://www.e90post.com/forums/showthread.php?t=365866
and this one is for speakers and other stuff