Im using M-tech bodykit,but I dun think mtech sideskirts are wider.If you like the sideskirts which can make your car looks wider and lower,M3 style sideskirts would be a good choice.But as I remember,M3 sideskirts for M3(any brands)are not fit E92 non-m3.We can only get the 'M3 style' but not 'M3' one.Check this out :
http://www.e90post.com/forums/showthread.php?t=169445
http://www.e90post.com/forums/showth...=M3+sideskirts