K & N Air Filter - CRF250/450R XD HA-4503XD Black/Red The inter core tube is

The inter core tube is made of stainless that slips over the entrance and into the exit cap that is a covered with a Carbon Fiber beauty cover

Outer shell design outlines a stylish

Designed with aesthetics in mind and to be installed over your existing OEM engine cover

Expanding knurled insert allows for single point mounting

K & N Air Filter - CRF250/450R XD HA-4503XD Black/Red The inter core tube isProvide high capacity, with low restriction, resulting in increased horsepower and torque Deep pleats provide high airflow and long service intervals Designed to increase horsepower and throttle response Pre oiled and ready to race! No fuel management modifications necessary Strong, pliable molded flange and seals Made in the U. S. A.