I am not so sure what I think of it. I bought the WB E-series S Bend, and I am looking at this thing thinking man this feels heavy, and how the heck is it supposed to breath better through these discs? I dont honestly know what my stock pipe weights since I havent got it off yet. Just some history, I bought the pipe because I need to quiet the bike down for a CCC ride and have a spark arrestor. I was just hoping not to give up to much performance in doing so. Anyhoo, sorry for the long post, just venting a little anxiety.