Here's a couple of links to two little videos with sound that Che sent me so I could hear how the muffler/header combo sounded. This is a white boxster located in Japan...
http://www.iwantaporsche.net/BoxsterExhaust1.wmv
http://www.iwantaporsche.net/BoxsterExhaust2.wmv
My car now sounds exactly like this from what I can describe. LOUD and THROATY