Exhaust gasket.
 

Had engine light come on, was Cat (covered under warranty). Had it in for the CAT, next day, 2014 RVR GT seemed louder. Took it back in, was told it was an O-ring gasket in my exhaust. (The same exhaust that just had the new CAT installed... They're telling me its completely unrelated and just a coincidence. I seriously doubt this and have began sourcing my own part. I'm having trouble because I cant find a schematic of an RVR exhaust... Any help?? Is it the same as the Lancer? Outlander?

Any insight would be greatly appreciated.

Havings problems with my exhaust too. even exhaust shops dont know its doing my head in