2009 infiniti g37 sedan - powerful rear-wheel-drive (RWD) sports sedan.Infiniti's G Sedan was launched in 2003 as a powerful rear-wheel-drive (RWD) sports sedan. It was positioned as an alternative to the BMW 3 Series, Lexus IS and Audi A4. In contrast to the competition, the Infiniti sedan not only offered more interior space, but it also trumped the others with Nissan’s powerful VQ-series 3.5-