I wasn't happy with the sound after just swapping the stock muffler for a 14" Magnaflow, so I removed the two rear resonators and it really brought it to life!
Cold start for your listening pleasure.
+1 on the reverse braking, I also turned that off after almost receiving whiplash while backing out of a parking spot and the object wasn't that close.
It goes by your Vin so if it hasn't been updated since ypur truck came off the assembly line you probably need it. After you download the file you have to extract it to an empty USB flash drive. Pop the USB in the truck turn on radio and it will tell you your current version and version on flash...
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