BRAND NEW BIG GUN OVER REVBOXThis part will fitaSuzuki LTZ4002005-2006-2007-2008-2009 years modelsKawasaki KFX400 2005-2006-2007 yearsPart #40-R02A*Improves RPM250Enhancedover stock.*This Rev Box is for theLTZ400 KFX400 DVX400(05-09)and it willenhance the RPM250over the stock CDI Box WITH A POWER GAIN.Ready to install requires no special tools or wiresThis Rev Box allowsmore RPM to rev out higher than stock while advancing the timing for a more torque on the bottom end. These boxes will not put a strain on your engine or valve train components anymore than stock.Big Gun includesa 6 month warrantywith the Rev Boxes (first in the industry).Contact information; if you have any questions, we are here to help!