Audi RS4 Avant spied

You can forget about the V8 4.2-liter naturally aspirated engine of the previous model as Audi has already confirmed the new RS4 will make the switch to a downsized turbocharged motor. It will likely use the S4’s new TFSI V6 3.0-liter where it develops 354 PS (260 kW) and 500 Nm (369 lb-ft) of torque. In the RS4, the engine is believed to receive e-turbo technology and corroborated with other tweaks this will bump output to an estimated 480 PS (353 kW).

Source: worldcarfans.com