WelL i purchased the Sports Muffler Accessory (THis is not the OEM muffler that comes with Sports models G. I have a sports model G.) Reason I change mine is b/c of the rust and being able to see it from the back side. The car is a little louder and throatier and sounds great. This will fit the convertibles and the coupes. Thought i'd share what the difference looked like.
That's why I never got it, until I found it used. But I I didnt want to go with the invidia cat back because with the top down it would be too loud. This is just right with the top down.