The LaCrosse is Buicks all new premium midsize sedan that replaces the Century and Regal in the Buick lineup. The LaCrosse features QuietTuning aimed at reducing unwanted noise and vibration levels throughout the entire body structure to provide best in class quietness. LaCrosses ride and handling components are 80 percent new to deliver a smooth yet controlled ride. The 4 wheel disc brake system is larger and more durable, 16 inch wheels are standard on CX and CXL. The 2006 Buick LaCrosse offers ABS and side curtain airbags standard on all trim levels.