[Daves55Sedan]

I just cut pieces of 1 inch thick fiberglass insulation to fit the split tubes. Then I cut up old t-shirts and wrapped the insulation with the t-shirt pieces before gluing them to the inside of the tubes. I did not attempt to add filtration to these. Yes, there is a lot of dust that comes in. There's probably an inch of dust on my backseat because I never have any passengers and never waste time cleaning back there.