K&N has designed a performance air intake system for the 2008 and 2009 Harley Davidson FLTR ROAD GLIDE 1584, FLHX STREET GLIDE 1584, FLHTCU ULTRA CLASSIC ELECTRA GLIDE 1584, FLHTC ELECTRA GLIDE CLASSIC 1584, FLHT ELECTRA GLIDE STANDARD 1584, FLHRC ROAD KING CLASSIC 1584, FLHR ROAD KING 1584 and 2009 Harley Davidson FLHTP ELECTRA GLIDE POLICE 1690 and FLHP ROAD KING POLICE 1690. K&N dynamometer tests show an amazing 12.92 horsepower gain at 4612 RPM with use of this K&N air intake modification. K&N tests multiple vehicles for each air intake kit it makes to ensure a consistent horsepower and torque gain. This video features a power gaining K&N air intake installed on a Harley. Refer to each intake's instruction sheet for full installation details.