I was going to say that... Read the other thread.
What about a CAI that gives it a nice whistle when accelerating but not to the point where its an annoying sound?
If you really want a whistle noise, get a throttle body spacer, but I wouldn't recommend it for performance, just sound.
2012 Mustang V6 Premium | Black on Black - SOLD
Options:6-speed automatic | pony package | HID headlamps | security package | reverse sensing system | comfort package
Build date: 5/12/2011 | Purchased: 6/7/2011
Mods: tape stripe delete | 20% tint | Dynomax SS cat-back exhaust (39507) | smoked side markers | Injen intake (PF9022WB)