In 2000, an interlock was added to prevent shifting the transmission from Park unless the brake pedal was pressed; and tether anchors were added to the rear shelf for child seats. The 2001 model year brought more changes, with an optional luxury group that included an automatic dimming driver-side mirror and supplemental side airbags. A more advanced EVIC (trip computer) was made optional. The 300M also received new jeweled taillights. 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. 2004 brought optional Sirius Satellite Radio and an optional stereo with DVD-based GPS navigation. For the 2004 model year, Chrysler offered the Platinum Series 300M to coincide with the company's 20th anniversary of Chrysler's original minivan (Dodge Caravan/Chrysler Town & County/Plymouth Voyager). In addition to the 300M, five other vehicles were offered as Platinum Series: the Sebring Convertible, PT Cruiser, Sebring Sedan, Sebring Coupe, and Town & Country. The Platinum Series 300M was available only in three exterior colors: Graphite Metallic, Bright Silver Metallic, or Brilliant Black Crystal. Other features included: deep slate/light taupe two-tone interior, chrome door handles, deep gloss black turn signal mirrors with a reverse gear auto pivot feature, and 17-inch chrome wheels. A 360-watt Infinity II Cassette/CD player, and a no-charge SIRIUS satellite radio system with a one-year SIRIUS subscription were also included. Additional features