V&H CSONE to Voodoo?

[RMax]

This project should have been straight forward, but it seems like a piece is missing. In the first photo is the rear pipes after exhaust removed, second picture is the left side cat delete pipe. Third picture is the Voodoo cat delete pipe fitted. There is a gap, I'm confused, help!

 

[snoogle]

Parts numbered 29, 30 & 31 I believe, 30 is a clamp, one of the other two parts is a compressible ring which seals between the pipes., the other is a flange..
If you have the Cat still they might be there, I fitted CSONE, that's where I left mine to keep them safe...

 

[RMax]

You were right, had to order flange, gasket and clamp. Previous owner didn't need them when he installed the V&H CSONE. Ugh.....that was an extra $130 hit!