Viper was a steel roller coaster located at Six Flags Great Adventure in Jackson Township, New Jersey. Manufactured by TOGO at an estimated cost of $4 million, the ride opened to the public in June 1995. It replaced another steel coaster manufactured by TOGO, Ultra Twister, which was removed in 1989. Viper stood nearly 89 feet (27 m) tall and reached a maximum speed of 48 mph (77 km/h). It featured two inversions, including a heartline roll and a unique dive loop element developed specifically for this ride. Following years of maintenance issues, extensive downtime, and low ridership due to roughness, Viper was permanently closed after the 2004 season and demolished the following year. A record-breaking wooden coaster called El Toro opened in its place in 2006.