Changes to the 7.3 liter engine in 1994 gave birth to the 7.3 liter Power Stroke. By 1999, International had built 1 million 7.3 Power Strokes, and the 2 millionth 7.3 was built in 2002. Unfortunately, the 7.3 failed to meet stricter emission requirements and was therefore replaced early in 2003 by the 6.0 liter Power Stroke. The 7.3 is largely responsible for making the Power Stroke name legendary, as well as fueling the performance race between the big three.