I have the cobb quad tip with HFC. I think it is great. It gets rid of the stock exhaust drone. It isn't a loud exhaust, similar to stock at cruise, louder at WOT. I love the look and the sound, but the days of loud cars is behind me. Too may days of running open headers. If loud is what you are looking for cobb may not be the correct choice. If good sound, not super loud and able to make good power then cobb is a good choice. My car is built so I can enjoy it and my wife can drive it without complaining.