K&N XSTREAM PERFORMANCE POWERLID (01-05 Raptor)- Stock jetting is not recommended.- K&N has taken the guess work out of the equation. Thesepowerlids come with the appropriate main jet for your quad toperform at its full potential with the Xstream Powerlid.- Replaces stock airbox lid.- Snaps in place.- Allows increased air flow for more horsepower.- Elmininates restrictive intake snorkels.- Dyno tested.- Main Jet and Precharger Wrap included.