Installed on f150 4.6 3v and sounds amazing Cut out the stock muffler and weld in a new one. With the resonator on, the sound is loud when you press your foot, but not too loud. At idle, you won't say anything except a lower tone. Minimal roar in the cabin unless you sit on it. It only has a slight punch, which is nice, but then again, if the resonator were off, it would be more noticeable.