Other option would be a Remus setup. I did catback Remus on my 240 and it allows the retention of the exhaust valve. even with a catless DP, the system is mild when in comfort mode, but switch to sport and gun it and it sounds like a bat out of hell. Definitely turns heads and sounds nice.
I vaguely remember what it sounded like with the stock cat, but I remember that at idle you didn't hear the exhaust at all unless right next to it. Under load it sounded mild.
Here's the video clips: