If you want stock location, RJC has one. I can tell you from MY experiences. I had Pypes Race Pro 2 1/2 installed and super quiet. Like stock. They are a straight through turbo style muffler. Now I have the Hooker Aero Chamber on and neither drone, or that is noticeable to me. The Hookers have a little rumble at idle, roar when opened. The Pypes are quiet with a little rumble when opened.