mary 2009-06-01 K&N has designed a performance air intake system for the 2004-2009 Yamaha YFZ450 Sport ATV. K&N dynamometer tests show a 4.27 horsepower gain at 7200 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 demonstrates the steps needed to install a power gaining K&N air intake into an 2004 to 2009 Yamaha YFZ450 Sport ATV. Refer to each intake's instruction sheet for full installation details.
