Make sure you oil the K&N filter or you may/will damage the engine by sucking in all that dirt.The nuts on the cover are SAE 3/8, take those (3) off, pull the filter out and wash it in hot soapy water, rinse and let dry then reinstall. The nuts can be a bit of a pain since they are on the backside of the intake, but I used an open end 3/8 and got them off without to much of a hassle.