K&N has designed a performance air intake system for the 2009, 2010 and 2011 Audi A4 2.0L, Quatro and Cabriolet. K&N dynamometer tests show a 18.14 horsepower gain at 4435 RPM with use of this K&N air intake modification. K&N tests multiple vehicles for each air intake system it makes to ensure a consistent horsepower and torque gain. This video demonstrates the steps needed to install a power gaining K&N air intake into 2009 and 2010 Audi A4 with the 2.0L engine 2.0L, Quatro and Cabriolet.