Amazing quality and 70% noise isolation. I used to have Flowmaster Flowfx mufflers, they were really, really loud, so loud you could hear my truck several blocks away. This thing deadened the noise and made the exhaust sound like a European car. The noise insulation is very sophisticated and sounds like an expensive exhaust. It's not noisy at all, but enough to let you know you have power in your car. IF you have a cold air intake, then the sound of the cold air intake with this muffler will be