size of wheel lip/offset?
So you want to low but not deal with the sounds of being low? 3/8s of material under your frame just kills the clearance you have left. I would either leave it with 1/4 metal and deal with the sounds or raise the car up so you don't have to deal with them. Just my opinion, but obviously it's your car so it's your call.
Links are dead - red X's. I'd love to see it though!