Ok, I was talking to one of the reps at Flowmaster and he recommended that I just get a replacement muffler to take place of the big fat stock muffler. My 2013 Silverado has a chrome exhaust tip that I like a lot. He said to go with the Super 50 (part# 853057) over the Super 40 as with the AFM will sound like crap when it goes into V4 mode. Do any of the forum members have any input on the Super 50 on a 5.3 Silverado with a single exhaust out? Does is sound good? Thanks.