K&N has designed a performance air intake system for the 2007, 2008, 2009, 2010 and 2011 Jeep Wrangler 3.8L. K&N dynamometer tests show an estimated 7.92 horsepower gain at 4807 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 2007, 2008, 2009, 2010 and 2011 Jeep Wrangler with the 3.8L engine.
http://www.knfilters.com/video/77-1553KP_Install.html