So I am looking at installing it this upcoming weekend, but looking at it I am a little confused. It claims to be turbo back but there is clearly no downpipe in the set. I know this because my downpipe meets my exhaust turbine housing at a 90 degree angle and there is no part that has that angle. Also there is one section in there that doesn't have exhaust flanges on it, it has what looks like a clamp, what does that clamp to?