Here you can see how clean my main filter stayed by using the Pre-Filter setup
reducing the chances of dirt entering the engine.


When you remove the filter the support cage should stay in the air box if it was installed
properly to begin with, it is a tight fit installing and removing the filter with this installed
and is a must that you keep the inside of the box clean when changing filters. I like to 
use a vacuum cleaner and vacuum out the box before and after removing the filter.


That paper towel was installed soon as the box came off to keep the dirt out.

Pressure testing is a must before taking any engine apart!


The wet spot you see is where I sprayed windex to see if there was a leak,
the engine held 11 lbs for 35 minutes :-)