I have decided after looking at several systems.......
 

That Fabspeed motorsports are the way to go on a new exhaust. They show cutouts of B&B triflow, those things are worse than a stock exhaust. Plus I guess they break quite ofen. Check it out at fabspeed.com/ I plan on getting the exhaust, plus a cone intake setup or a bmc flat filter, and a german remapping of the ecu. It wont be cheap, It looks like a superior setup. Gain is approx 30hp at the wheels. Gemaballa looks good too, but I can drive my car to Penn and have the guys at fabspeed setup the car and do the remapping on the dyno. By the way if you haven't yet checked out their website, on the bottom of the homepage they have VERY"hot girls and a sound clip of a 996 with the exhasust. It sounds very angry and throaty, check it out, trust me.( fabspeed.com/)

wow- those pictures of those girls on the fabspeed homepage are almost pornographic. Serious "camel toe." hehehehe

If I were you I would check to make sure you don't void your warranty with the ECU mods. Maybe you do not care.

Those outfits redefine the word "skintight."