The deep rumble of the Flowmaster is unstoppable. I installed it myself on a 2011 Ram 1500 5.7 Hemi. It definitely makes Hemi sound like it should. I've seen a few reports of a slight rumble in the cockpit, I can hear it a little around town when going into "ECO mode", but it's barely noticeable against the rumble of the mud tires anyway. It doesn't fit directly onto the Ram because the Flowmaster is so much shorter than the massive silencer Dodge puts on to silence this beast. A trimmed 3-inch exhaust pipe from the parts store let it fit in there, and a slight adjustment to the rear pipes brought everything back in line with the factory fit and finish.