Midyear addition of a lower-cost V6 version and a new off-road package highlight 2004 changes to Porsche's unibody SUV. Cayenne shares its basic design with Volkswagen's Touareg. However, Cayenne is more expensive and has its own engines and styling. The new 3.2-liter V6 version, added in January '04, joins the existing 4.5-liter V8 versions. All engines come with a 6-speed automatic transmission with manual-shift capability via steering-wheel buttons or console lever. The base Cayenne's V6 has 247 hp, the S model's V8 has 340, and the Turbo model's V8 has 450. Cayenne's AWD system is designed for severe off-road use and has low-range gearing and a locking center differential. Available midyear is a new Advanced Off-Road Technology Package that includes side and floor protection along with a locking rear differential and antiroll bars that can be electronically disconnected for greater suspension articulation. ABS and antiskid/traction control are standard, as is leather upholstery. Optional on base and S and standard on the Turbo is a self-leveling air suspension with six driver-adjustable heights, including 10.7 inches of off-road clearance. Cayenne comes with 17-inch wheels, S and Turbo with 18s; 19s and 20s are optional. The liftgate has separate-opening glass. Available features include heated steering wheel and seats, steering-linked bi-xenon headlamps, navigation system, and obstacle warning. Towing capacity on all models is 7716 lb.