Banks cold air intake

I tested very carefully pre and post Banks when I had it on my 460 equipped motorhome. I gained .5 mpg with the Banks headers. Their really good with their almost 5/8 thick manifold flange. The ram air only rams your wallet. All the gains are from the headers. I took the ram air off. Worthless. The stock air setup is all you need and keeps your engine cleaner too.