This 2003 Audi RS6 features extensive modifications including a Marc Ehrenberg tune, Milltek cat-back exhaust, GIAC/AWE transmission tune, and Koni dampers replacing the DRC system. It boasts a 92-page maintenance file, including a new Audi crate transmission at 70k miles and a timing belt service at 105k miles. The car shows 121k miles and has a clean Massachusetts title, though the seller notes some clearcoat peeling and minor fluid leaks.