Originally Posted by obeney

I have a 04 with the GHL exhaust on it. The exhaust is loud under full throttle but it resonates bad between 2 -3k. It's even worse with the top up. I ran the car for a week with no muffler and I think that sounded better and had less resonance then the GHL.

Here is a website with some video of the GHL muffler.
http://yellowboxster.com/video.html

I can take some video of mine if you want as well.