The centre section is missing - you can either get the non-resonated one (louder) or the resonated one, sometimes they pop up on here for sale or you might be able to get one from Scorpion direct.
For reference:
Non-Resonated - You are missing the longer pipe at the top of the photo which joins on to the cat
View attachment 126246
Resonated - You are missing the pipe with the resonated section at the top of the photo which joins on to the cat
View attachment 126247