SVT Cobra is much faster. Also, the Cobra is NOT just a GT with a supercharger, the cobras are completely different. The Cobra has a 4 valve per cylinder V8 engine that is hand build by 2 guys and comes with a cast iron block and all forged internals. The GT comes with a 2 valve per cylinder engine with an aluminum block and no forged internal components and the engine is made on an assembly line by machines. The cobra engine because of the forged internal components, crank shaft, and cast iron block can handle up to and over 1000rwhp. Since the GT has an aluminum block and no forged internal components it can only handle around 500rwhp at very best. The cobra comes with a tremec T56 6 speed transmission which is one of the strongest and best trannys you can get and can handle up to and over 1000rwhp, it is the same tranny that comes in the $80,0000 dodge viper. The GT mustang comes with a basic 5 speed tranny that can not handle more then 500rwhp. The cobra comes with heavy duty racing brakes, the GT has just normal brakes. The cobra comes with an independant rear suspension, the GT comes with a solid suspension. The cobra has 17x9 inch rims, the gt has 16x8 so you can put 315's on the cobras where the widest tire you can put on the GT is around 255's. I could keep going on but I think you get the idea. The 03/04 cobras (nicknamed "the terminators" because of there ability to terminate the competition) are the fastest cars you can get for the money. They can run 12.8 and 12.9 quarter miles with the most novice driver. Evan Smith from Fast Fords and Muscle Mustangs ran a 12.43 with a completely stock 03 cobra. The fastest GT runs a 13.7 quarter mile at best.