So I bought the truck (2019 Bighorn) about 2 weeks ago and ordered the Flowmaster American Thunder Kit for the 19 (part# 817843). I took the kit to my muffler guy for install. When I got there he took a look under the truck (because this was the first 2019 Ram he was gonna work on), and told me I may not even need to install the kit. It turns out for the 2019 Rams with the Hemi's and dual exhaust, there is a resonator just downstream of the Cats, after that you have the main muffler, then the split for the dual exhaust, and then another muffler ( straight through glass pack) on each side just before the tips. He suggested removing the main muffler and replacing it with a straight pipe since there were already a resonator and 2 mufflers (one on each side). So I tried this and the truck sounds perfect to me.... its an extremely deep but not too loud sound, it sounds like a beast!! I went from spending $760 for the kit plus $250 for the install to only having to pay $165. The best part about it someone just said to me that the truck sounds great what kind of muffler I have? I told him it was the stock muffler, he did not believe me although I was telling the truth.