Foam Prefilter for Standard Oval Air Box

Our Foam Prefilter is the best way to keep dirt out of the engine. Captures almost all of the dirt before it can reach the cotton element of the air filter and saves time because it allows 3 or more races in between cleaning the air filter. We sell three versions. 600-5153 fits the flat filter air box and 600-5155 fits the std oval box and 600-5155-2 fits the Guhl and the EVO oval air box. 
To use, spray the foam prefilter with 77-260 Klotz Foam Air Filter Oil and install it in the airbox. We performed many back to back dyno tests showing no loss of horsepower.