Me. AEM. None. Other than not having the urethane bushing and bolt to keep it secure to the frame. But that's because I bought it used.
But the people at AEM were more than willing to send me the parts. Currently, it's being held to the frame with a shoelace. Lulz
OH, also. The MAF sensor cables connected to the battery housing made it so that the bottom portion of the battery housing kind of loose, but it's still good.