In 2002, electronic brake distribution was added to the antilock brakes; a new computer combined engine and transmission controls; latch tethers were now built-in; and "natural" evaporative emission monitoring was added. The 300M Special was offered beginning midyear 2002. It featured a 3.5 liter engine designed to use premium (91+ octane) gasoline and producing of torque, with a 3.89 final drive ratio. Performance-type dual exhaust, high-performance brakes, and 18-inch Z-rated tires were standard, with Michelin Pilot Sport 245/45R18 performance tires optional. Other standard features of the Special included premium "Waterfall" leather seats, signal mirrors, body cladding, and slightly lower ride height. This model also included high-intensity discharge headlamps and imitation-carbon-fiber interior trim panels that replaced the standard woodgrain trim panels. A limited number of 300M "Pro-Am" models were marketed during 2002. These versions included an Infinity audio system with subwoofers as well as two-toned leather interiors. The Pro-Am also came with a set of limited edition golf clubs and a holder for a golf bag in the trunk. In 2003, new colors were added, a six-disc CD changer replaced the four-disc changer, and the changer controls were added to the stereo.