Extreme II is the fastest commercial vessel in Sydney. Powered by twin 425 horsepower V8 engines, this 11.3 metre rigid inflatable vessel can reach speeds of up to 90km per hour. The completely open design of Extreme II, along with its lower position in the water, offers an unparalleled, unobstructed and up close viewing experience. Passenger capacity is limited to only 21 for a personal, boutique tour. The minimum age is 12 years old.