Not as of yet, I've been toying with the idea of using some mesh screen in the box entrance itself once the snow is gone...maybe even something for the 90,...a pre filter of some sort that I could slip on if conditions call for it,...In either case I always have a spare filter in my tool box.

 

4"hole, PVC 90, dryer hose, shower screen to keep the big stuff out, Amsiol Ea 189 filter, insulated inside of box. No big HP or milage gain. Turbo whine is louder.

 

4"hole, PVC 90, dryer hose, shower screen to keep the big stuff out, Amsiol Ea 189 filter, insulated inside of box. No big HP or milage gain. Turbo whine is louder.

 

4"hole, PVC 90, dryer hose, shower screen to keep the big stuff out, Amsiol Ea 189 filter, insulated inside of box. No big HP or milage gain. Turbo whine is louder.

 

I use pantyhose for the intake screen for mine.

MikeyB