Not in the same season LewisWDC! They are banned but weren't illegal. Big difference. Here you go El Bando: "For 2011, KERS [hybrid] is now a single integrated unit that sits within the survival cell, beneath the fuel-tank. In 2009, it was housed in the sidepods. The hybrid's cooling intake sits directly below the main roll-hoop intake. "And, once again, we've really pushed the car's cooling configuration: we've got a second air intake on the engine cover for gearbox and hydraulic cooling."
...................................................... LewisWDC...........................yes you guessed it...........BANNED ! (sorry couldn't resist it)