I've driven the 991 version of the Turbo S (plenty of times). Enough to know that it is not a quiet vehicle... at least not the way I drive it. Besides, I really enjoy the sound of the engine too. The turbo intakes right behind you sound like big vacuum cleaners!Have you driven the turbo S yet? It’s not as loud as you might think.
My point is that; I'm not trying to make the 911 into an SQ car... at all. I have a BMW X6-M for that. I just want something in there, that is better than the crappy stock Bose system.
As for the tweeters; I was thinking something like this: