Porsche has revealed plans to introduce a new ultra high performance GT3 version of its 911 Carrera coupe to world markets in spring 2003.  The new model will be the most powerful non-turbocharged Porsche ever offered for street use. Based on the previous 911 GT2, the GT3 version features a 3.6-litre, flat-six cylinder engine producing 380 horsepower and 285 pound-feet of torque.