The XC90 is available in two variations: the base XC90 2.5T with its five-cylinder engine and the XC90 V8 introduced for 2005. (The six-cylinder T6 model has been discontinued.) The XC90 2.5T uses Volvo's proven inline five-cylinder turbocharged engine. This 2.5-liter engine is rated at 208 horsepower and 236 pound-feet of torque and comes with a five-speed automatic transmission with front-wheel drive. All-Wheel Drive with Instant Traction, which minimizes wheelspin, is available. The XC90 V8 is powered by a 4.4-liter V8 developed to Volvo specifications by Yamaha. The new V8 generates 315 horsepower and 325 pound-feet of torque and is mated to a six-speed automatic transmission. The all-wheel-drive system with Instant Traction comes standard.For 2006, the XC90 gets a revised all-wheel drive system and changes its available models.