Continuously Variable Valve Timing (CVVT) is added to the 2004 Hyundai Tiburons standard four-cylinder engine this year, cranking out 138 horsepower at 6,000 rpm while improving fuel economy and emissions. The performance-oriented Tiburon GTV6 gains two horsepower to make 172 ponies for 2004. Inside, a new metal grain finish replaces black plastic for the center stack and window switch surrounds, and the floor mats have been upgraded