I was haveing a gas millege drop bike running rich. I went from the green air filter to the red one. little did I know the paper element was different. now I bought them from honda the were not after market. my gas millege dropped to 35 or 36 MPG. I was thinking something was messed up in the carb. By the way it's a 2004 VTX 1300. I can't find the green filters. so I went and bought a K&N Filter to my surprise it cleared up bike is running great.and my MPG. went up to 44 MPG. so I think some other company is makeing the filters for honda now. So if your have a simular problem you mite give this a try.