Your engine is a 3.8L, The bore and stroke is the same as it has always been. I asked the Ford technicial rep that visits the dealership I work at and His answer was "because they redesigned the intake manifold". I asked him how an intake manifold increases engine displacement and he just laughed and couldnt answer why! So I asked If Ford could design a manifold for the 4.6L to bring i up to 5.0L!! 
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2004 Torch Red GT
Flowmaster Am.Thunder cat back, SLP Mid Pipe
Steeda Underdrive pulleys
3.73 gears
Diablosport Predator tune
Grille Delete and Mach 1 spoiler
Rear Wing delete 
Mustang Tuning Shifter
Bullitt Handling Kit
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