I have been researching this for a couple weeks now, and I can't seem to find any DETAILS on how to install this muffler: I want the Flowmaster Super 44 muffler with dual inlet and dual outlets. Part number 8425454 for the stainless steel one that I have selected. This muffler has 2.5 inch inlets/outlets which is fine. I can adapt them to the 1 7/8" OD pipes coming off the cats. My issue is this: the Flowmaster muffler states that it has a 5" center to center measurement of the inlet pipes. My truck appears to have a 6" center to center measurement right before the stock muffler- I crawled under it and measured. This ends up being a half inch difference for each pipe/muffler inlet to overcome. But, if the exhaust adapters are to slip-fit over the stock pipes and slip-fit into the mufflers, then it wont go in and play nicely. I plan on clamping the exhaust together with band clamps, as I currently don't have access to a welder. All of the research I have uncovered states that people have apparently put a single Flowmster dual inlet/outlet muffler on these 96-99 trucks with dual exhaust into the stock muffler, but they don't explain how they overcame this apparent issue. I prefer to put only one muffler on the truck, as this will also act as an H or X pipe as well. Plus, it's less expensive. I have my built parts list to do the dual exhaust myself, but am reluctant to order all of the parts if I am going to have a big issue with the muffler attaching to the stock dual pipes of the truck. Does anyone have first hand experience with this, or know where to find the threads about this? What I am looking to do: Flowmaster super 44 stainless muffler p/n 8425454 Flowmaster dual exhaust pipes 2.5" p/n 15811 assorted band clamps from summit of the appropriate size assorted exhaust hangers from summit as well I just replaced my plugged cats with Flowmaster y pipe p/n 2010023 (truck had an efficiency code for bank 2, plus I used a handheld thermometer to verify that the inlet of the cat was 100 degrees hotter than the exit (which is the opposite of what it should be)). Now that I have that corrected, the stock muffler is next to go. The truck has 208xxx miles on it. I did look at a complete cat-back system, but I am not interested in dropping that much coin. Any advice is appreciated - as I want to get parts ordered fairly quickly. Thanks so much!