The 1998 Ford Cobra curb weight is 3,391 Coupe 3,531 Convertible
There is no such thing as a 1991 Mustang Cobra, SVT did not start producing the Cobra until 1993.
The 1994 Ford Mustang Cobra SVT was rated at 240-horsepower
The 1995 Ford Cobra has 240 horsepower 5.0L V-8
The 2004 Ford Cobra has 390 horsepower 4.6L DOHC V-8
2001 Ford Mustang : GT , 260 horsepower Bulitt , 265 horsepower Cobra , 320 horsepower
320 to the motor, 280 to the wheels
The 1997 mustang cobra came stock with a 32 valve 4.6 DOHC engine producing 305hp and 300lb ft of torque.
The 1998 Ford Cobra has 305 horsepower 4.6L (281-CI) DOHC V-8
http://auto.howstuffworks.com/1965-1966-ford-mustang-specifications.htm
The 2000 Ford Cobra R has 385 horsepower 5.4L (330-CI) DOHC V-8
1997 cobra's have 305 horsepower. have a book on every mustang and cobra's ever built and specs.