Yup Eddy... I wrapped those things as tight as I could get it. The raspy sound has been reduced by a small percentage but it is still there. The 'scoops' or 'louvers' faced rearward on mine too, that is until today. Richard had an idea that turning them into the flow of gas might help make them quieter. I did that, but with little to no noticeable difference. I will try a couple more things like the washer idea and if that doesn't tone them down I'll consider letting them go.