I have the Ragazzon exhaust fitted to my GPA.

You can buy the parts separately if you wish.

The back box can be fitted to the standard mid pipe. The Ragazzon back box has a 60mm entry pipe but comes with a sleeve that will fit the standard pipe.

I have also bought the 60mm flexy pipe that fits to the standard cat. Then I have the 60mm centre pipe without a silencer. So altogether I have a 60mm stainless system running from the end of the standard cat through to, and including, the back box.

It is also possible to buy a Ragazzon down pipe that replaces the standard cat and then fit a Ragazzon 60mm centre pipe that includes a 200 cpi sports cat. Is that clear? If not I'll try to answer your questions further.