Steeda told me they can have both but did recommend me the BBK. They don't have any of the 2 models in stock. Don't know if the leaks are true. Anyway I don't think they will be a big difference in hp between the 2.
2012 Mustang 5.0: 4.10, Torsen T2R, Steeda CAI, Boss Intake manifold, JBA O/R Xpipe, Kooks shorty headers, Accel Super coil, BBK 90mm TB, Eibach sway bars, Eibach prokit springs, Steeda struts, Steeda camber plates, Steeda aluminium driveshaft, Steeda short shifter, Steeda adjustable LCA, Steeda adjustable UCA, 20in Enkei Razr, Falken FK452, Flowmaster American Thunder, Ford racing brake ducts, hawk pads, boss exterior mods, California spoiler