I recently installed the Borla stingers on my 04 Cobra and I'm already used of it and now I want it louder. The MRT catted H-pipe is the choice I'm going to make but I want to know if they "ll pass a sniff test. Would it be louder is what i'm hoping for or is it a waste of time. Also would I have to get the predator to retune the computer after installing a catted mid-pipe?