The TSX offers a choice of a six-speed manual gearbox or five-speed automatic with Sequential Sport Shift at no extra cost. A navigation system is optional. The 2.4-liter iVTEC four-cylinder engine boasts a broad torque curve and is rated at 205 horsepower. It comes available with a six-speed manual or five-speed automatic with Sequential Sport Shift. Standard equipment includes perforated leather seating, moonroof, HID headlights, and a 360-watt Acura premium audio system with six-disc CD changer and eight speakers. Standard 17-inch nine-spoke alloy wheels come with V-rated performance tires.For 2006, the Acura TSX gets more power and there are significant but subtle revisions to the exterior styling.