Originally Posted by ATL E92
AE, perfect fitment, nothing required other than the right wrenches (BMW likes to use 10 different sizes for everything....)
However, I'm speaking from a e92 standpoint, but everything i've read is the e90 is just as perfect fitment wise
as long as it's the dual tip.
quads was a pain in the ass if you didn't have a quad diffuser and wanted to trim it. =[