So I have a completely stock evo x that’s never been modified. For the past few 3 months I’ve noticed my exhaust slowly getting louder. Recently I did not drive it for about 2-3 weeks and I’ve noticed that it is suddenly running rich with exhaust pops/presumed fireballs between shifts and if I give WOT the exhaust note sounds like it’s shooting out some excess fuel like my old wrx did when I went catless and I was untuned. There are no CELs. Did I blow a cat or something? I have not noticed the catless smell yet but was mostly on the highway and very little local driving. Since I am stock should I bring it to the dealership or perhaps one of the well known So Cal evo shops?