I pulled my air filter today just to check it out and see how big it was. After getting it out i thought it looked the same as the filter in my 250R. I went online and found the part number for the 300 air filter and come to find out it matches the part number for the 250R. That means the K&N air filter for the 250R should fit just fine. Also for anyone familiar with the 250R intake system it looks like on the 300 we will be able to do the same snorkel mod to the airbox.