So I am building a custom cold air intake. I dont wanna use 3 inch tubing for it. Anybody have ideas for some 4 inch tubing. I was thinking about 4 inch PVC with some rubber fittings and painting the PVC black, but that isnt eye appealing. Or any ideas where I could buy 4 inch material tubing meant for cars. I checked Pepboys, but all they had was 3 inch tubing. Thanks.