I almost forgot, when I ran with Chin Motorsport in August, a friend of mine showed up with his 03 Boxster S with straight pipes. Is it loud? Well, yah!! if you want I have a utube vid following him for the warm up and first lap. I could only hear his exhaust, I have headers and no cats with a loud borla on mine, but his exhaust definately occupied my ears. lol Here is the link if you want to hear straight pipes
http://www.youtube.com/watch?v=kSaz17vWKTk 