This 2003 Audi RS6 is a gray-over-black sedan that is powered by a twin-turbocharged 4.2-liter V8 paired with a six-speed manual transaxle and Quattro all-wheel drive. Additional modifications include an Aquamist HFS3 methanol/water injection system, EFI Express engine management software, Wagner Tuning intercoolers, KW coilover suspension, a Milltek exhaust system, a front lip spoiler, tinted tail lights, aftermarket exhaust components, 19″ RS4 wheels, and JH Motorsports shift linkage. Factory equipment includes Bose audio, dual-zone automatic climate control, carbon-fiber interior trim, power-adjustable front seats…