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2003: This was a banner year for the 4.6-at least in Four-Valve form. Stick-axle fans got a naturally aspirated DOHC in the new Mach 1, producing 305 hp and 320 lb-ft, while the rest of us were smitten by the supercharged Terminator Cobra with its berserk off-idle torque and 390 hp. Meanwhile, the Two-Valve GT held steady at 260 hp right through the end of 2004.