I just installed the Flowmaster Super 40 Series muffler on my truck. The stock muffler is beyond heavy and has to support hangers just for itself. Either way i had to do minor modifications because i didnt measure the outlet size correctly. 3inch inlet and 2 1/8inch outlet for those who are looking to buy a muffler. It sounds MEAN!! i highly reccomend this muffler, ive gotten alot of looks just from the sound!