Good, no,since there is no filtration at best they have a screen to keep the big stuff out. Won't matter in the short term though. In the long run it could shorten the life of your top end. That depends a lot on how dust and dirty your area is. The more dust, the more dirt that goes through those stacks and acts like sand paper in your cyl.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!