Engine Air Filter

It doesn't get any easier then this, or does it? lol

The only issue here is you'll notice the hole center in the bottom of the filter isn't centered and you can rotate the main body of the filter 360 degrees. The building materials didn't give us the position to mount it so we faked it and went for adequate clearance from the flywheel. 

Later on you'll find out you have to shell out some bucks on a cleaning kit consisting of cleaner and an oil to keep the filter in shape.