The part number I have for the K&N filter that came with my snorkel is GA RC-3180. Measuring the box since the filter is on the car it roughly measures: 3" x 4 3/4" x 9 1/4". I don't know if that's big or small for the sho. It's a high-flow filter/filtercharger. I've had mine less then a year. Seems to work fine. No problems that I can quantify. Mark M.