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I just had a Banks 4" monster exhaust installed for added performance pulling a 12K# 5er. The Banks is pricey, but man does the truck sound and perform great. I haven't pulled the 5er yet, next Monday we will be headed north with it. My truck has 67K miles and is a thing of beauty, and totally stock except for the exhaust. I was going to get the MBRP exhaust which many members on this site have expressed nothing but high praise for, but when I was driving around looking I decided on the Banks. This site is the best place to look for what's available to help you make a good decision. Good luck!!