A multifunction steering wheel is standard on all 2004 models. New alloy wheels, a chrome grille and body-color bumpers plus a more luxurious cabin were introduced too. New dynamic control systems include the Electronic Stability Program (ESP), Brake Assist and the 4 wheel Electronic Traction System (4 ETS) were available as well. The G55 AMG is upgraded with a supercharged V8 engine developing 476 hp.
Models produced prior to 2007 had lower-quality materials and less advanced interior controls. There were additional upgrades for '09, including slightly different exterior styling, a more advanced COMAND electronics interface and additional standard features like multicontour ventilated seats and an iPod interface. The G550 and its accompanying engine/transmission combo also supplanted the G500 that year, while the G55 AMG was bumped up to 500 hp and 516 lb-ft of torque. Mercedes discontinued the G55 AMG model following the 2011 model year, replacing it with the G63 AMG in 2013.
Relay G55 is built for rock-solid performance night after night. Featuring a robust metal body, the bodypack transmitter is rugged, reliable and ready for the road. The receiver is housed in a solid aluminum chassis and fits easily on top of an amplifier, while the optional rack mount kit makes it easy to adapt Relay G55 to any professional installation.