Installed on my 2008 Dodge Ram 1500 5.7L Big Horn. I ordered the muffler shop to remove all the stock resonators and crap behind the cat and put the Flowmaster in line. Sounds good! It doesn't make much noise at idle, but when you put your foot in it sounds fantastic! Not sure how it will sound with the stock resonators, it might sound soft and quiet, but I would definitely recommend removing them.