250r air filter

I am cutting down my air filter in my 09 250r and wondered what the procedure was. Brian of Assfault Junkies suggested it but I did not track the how. Thanks for all help and to Brian for the suggestion.

 

Cutting the air filter down.. or the air filter box?

 

He cant legally cut the air box. look at superbikeconnection.com for more 250 info....

 

Thanks guys I did not know it was prohibited

 

You can "thin" the stock filter, just cant mess with the box.