Isn't AA sport a 5"? I would think it would slip in there without much trouble, a 7" is a tight fit, but I bet you can still mount the slek without issues. There are plenty of people on the forum with various lips and aftermarket FMICs.
E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII