You cant go wrong with JLT or C &L but my vote goes for a Steeda from Brenspeed with tuner and Saleen air hose/elbow.It looks really nice and it adds some nice power too. They will let you get the Saleen elbow instead of the ugly and meltable (is this a word) plastic elbow. And Steeda will work with a Saleen blower if you use a flexible elbow/hose unlike most CAIs.
2005 Ford Mustang GT Torch Red Manual
Saleen Super Shaker 3.4 pulley/Brenspeed Tune
Kooks Longtubes Catted H/FRPP Stingers
Full BMR And Steeda Suspension
SOLD!! I have no Mustang at this time!