for a long time. does dirt eventually get into your intake? is it bad for your engine? or is it harmless and only affects flow

 

Your filter will actually benefit from having a little built up dirt on it, because that in turn filters out even more gunk.... But dont wait too long, because it will just be really dirty and you will not be gettin the maximum amount of air in your filter because of all the dirt build up, you have to have a medium...

 

thats good to hear