http://PetalumaHyundai.com 707-981-4203 For 2012, an already strong engine lineup is bolstered by a 5.0-liter V8 powering the new 429-horsepower 5.0 R-Spec model, while direct-injection technology now catapults the base V6 well past 300 hp. A new eight-speed automatic transmission also helps the 2012 Hyundai Genesis achieve better fuel economy. Outside, the Genesis receives some styling tucks, with tighter, more sporting looks front and rear.