Installed on 2018 RAM 1500 300hp 3.6L engine. Welded instead of a normal silencer. The factory resonator has remained. Paired with a K&N air filter. Got 2 mpg in the first week. There is no drone in the cabin. Sounds great at startup. Not Hemi, but sounds a bit meaty. The exhaust store charged me $115 for the installation. $600 cheaper than a Magnaflow LOL Cat Back. GREAT choice for V6 Ram