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Put a Banks 4" Monster Exhaust on my dually a few years ago. As mentioned earlier, max exhaust temps dropped around 110 degrees cooler especially pulling hills. I talked with the distributor about the noise before I bought the system. With the Banks exhaust system I got (stainless from turbo to tail pipe including muffler), the sound was barely more than stock which was what I was after. Driving down the road with the exhaust roaring gets old after a few miles! Overall conclusion ... exhaust temp runs cooler, turbo spools up quicker, minimal fuel mileage increase, but you will notice an increase in HP. I doubt if you could justify the installation on fuel savings alone unless you drove a boatload of miles ... exhaust temp and HP was the selling point for me.
I installed the kit in about 3 hours with minimal complications. Hardest part was jacking the truck up high enough to get the tail pipe off without cutting it as I intended and did sell the stock stainless system at a swap meet.
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