I have a 40 series flowmaster muffler (3inch in/dual 2.5in outs) and I am looking to sell it. It has never been used and is still in its box. I purchased the 50 series exhaust system that was fit to my truck and installed it. I wanted to use the 40, but since I am not a welder I decided to just go with the 50. If you are interested about buying the muffler just PM me. Like I said though... It is brand new and has never been used once. If you are interested in buying it then make me an offer... please only resonable offers and no joking ones.