Porsche passes on 2007-model Cayennes, saying that '06 versions will be available until a redesigned truck arrives later in the calendar year as a 2008 model. This SUV shares a basic design with the Volkswagen Touareg, but differs in styling and engines. The base Cayenne has a 247-hp V6, the S and S Titanium Edition a 340-hp V8. A turbocharged V8 makes 450 hp in the Cayenne Turbo, 520 in the top-line Turbo S. The V6 comes with a 6-speed manual transmission or a 6-speed automatic; V8s are automatic only. Cayennes have all-wheel drive with low-range gearing and locking center differential. An off-road option includes a locking rear differential. A self-leveling suspension with driver-adjustable firmness and ride-height settings is standard on Turbos, optional otherwise. Turbo S has specific suspension tuning and larger brakes. All models include ABS, antiskid/traction control, front side airbags, and curtain side airbags. A navigation system is optional. Also available are heated steering wheel and seats and engine-off climate-control operation.