I bought a used 2004 CRF250r today. The guy included an FMF Factory 4 exhaust with it that wasn't on the bike. The header on this pipe isn't made like most i've seen as their is no lip on the cyl. side end with a flange to bolt to the cyl. I'm unsure how the header attaches to the cyl but it looks like I must be missing a piece. Can anyone help me out?