Take a look at the FabSpeed system for the 997 Turbo at http://www.fabspeed.com/997TT.html, the tips look much better on the car than I imagined. The system is basically the same as ther 996 Turbo kit. I love the sound of the Cat bypass pipe. If I had a Turbo I will fit it with ther Maxflo Silencer withought the cats and a bypass pipe for the track so basically straight-out when at the track. All turbo`s in South Africa run de-ctivated cats anyway, in other words the cats are ther but withought the precious active metals so after cat oxygen sensing is also inactive. therfore running withought cats won`t store any faults in the system.