Exhaust Routing- Stock or not?
My d90 has LR on the cats, so I believe the cats are original, or stock replacements at some point. I put the liquid steel on the exhaust to pass emissions, and it works great. The problem is that I missed a hole on top of one of the pipes on top going into the exhaust pipe, so I still get the exhaust smell. And, I want a permanent solution (new exhaust). I believe the current muffler is a Gibson, and has a sweet sound.
Is the muffler setup- 2 pipes (I believe each is 3.5inches around) into the muffler- stock? I want a magnaflow, but I think its one input and one output. What can be done to merge the 2 pipes from cats to muffler into 1 so I can get a magnaflow? FYI manifold gaskets are new, so I do not think there is any leaking there.