The XLR features a magnetic-fluid-based real-time damping suspension that adapts to different road conditions. It achieves a 50/50 weight ratio by rear-mounting the six-speed automatic transmission with manual shift mode. A 320 horsepower 4.6-liter Northstar V-8 engine and 18' wheels are standard on this luxury convertible roadster. Inside, two passengers sit in a luxurious leather, eucalyptus wood and aluminum interior. For 2007, the Cadillac XLR gets a six-speed automatic transmission and two special editions: Platinum and Passion Red.