I just went and picked up my new truck today not new its and 03. When I got it home i found out it had an Afe intake on it. I think it's a Stage 1. I was wondering what the differance between stage 1 and stage 2 is. Plus the filter is black which I am guessing because its very dirty. I there a good dry replacement filter for it. I was thinking there might be a good amsoil filter for it. Also, is the torque tube for the afe worth the money.