Buick replaced its Century and Regal sedans for 2005 with a slightly larger version of their basic front-drive design. LaCrosse offered five-place seating with front buckets or six-passenger seating with a flip-and-fold front center seat. Three trim levels were offered: CX and step-up CXL use a 200-hp V6. The top-line CXS had a 240-hp V6. It came with a sportier suspension and 17-inch wheels vs. the others' 16s. All used a 4-speed automatic transmission. Each LaCrosse had 4-wheel disc brakes. ABS and traction control were standard on CXS, optional on the others. An antiskid system was an exclusive CXS option. Curtain side airbags were optional on all; front torso side airbags were unavailable. CXL and CXS had leather upholstery. Optional on CX and standard on the others were a tilt/telescope steering wheel, dual-zone automatic climate control, and a split folding rear seatback. Remote engine start and a sunroof were optional on all.