Sleeving OEM Exhaust Back Together

Hi,

Has anyone gona from an aftermartket exhaust back to OEM?

Can someone point me in the direction of what "sleeve" they used?

Want something of good quality that will do it's job properly, and can you let me know what size is required?

Thanks
 
Standard cat is in place, it is a catback system.

Possibly going back standard already yes lol...
 
Not entirely decided yet, for now I just need to know about sleeving my standard system back together...lol
 
Go speak to a local exhaust place, they should be able to do it easily for you or atleast measure up and supply you an offcut of pipe that will do the job