Here are the features that make a Bullitt a Bullitt...
Engine and transmission modifications
The new cast aluminum intake manifold has an increased runner diameter to maintain low-end torque and provide a broader power curve for increased top-end performance.
A twin 57mm-bore throttle body replaces the GT 65 mm throttle body, allowing for quicker throttle response and increased peak flow.
To reduce parasitic losses, the alternator pulley was increased to 66 mm and the water pump pulley was increased to 140 mm.
The exhaust system has been retuned to increase flow approximately 20% and give the Bullitt a new distinct sound.
All Mustang Bullitts will have the new TR3650 transmission and clutch assembly that provides improved shift quality. A new 11-inch flywheel and clutch assembly have been added to increase torque capacity and reduce clutch pedal efforts.
Exterior
Pony on grill is centered in a blacked out coral instead of chrome.
Does not come with a spoiler.
Brushed aluminum gas filler door.
Molded front mud guards.
Different Rocker Panels
Lowered by 3/4"
Red Brake calipers.
Fake rear brake venting is only extruding and does not have the honeycomb plastic grill.
Bullitt Badge on Trunk lid.
Rolled exhaust tips.
Molded c-pillars sweep forward instead of straight down.
Interior
Brushed aluminum looking shifter bezel.
Brushed aluminum shifter knob.
Door sills with BULLITT logo.
Retro dash has white lighting and closely indexed speedometer.
Seats are stitched to emulate the style from the 60's..
New stainless steel pedal covers are positioned to provide better heel-to-toe relationship.
Here some good reading for you
http://www.stangnet.com/bullitt/indexpage1.htm
http://www.bullittarchive.com/7025.htm
www.IMBOC.com
FYI... There is also a 2nd Bullitt ID sticker/number under the rear seat, very easy to access...
http://www.bullittarchive.com/1002.htm
---------------------------------------------------------------------------------------