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Have been looking at some of the tunes and exhaust systems. It seems most products are for Cayenne Turbos. Does anyone know of a Tune for the Cayenne 'S', what are the gains, any issues (i.e. warranty, etc)? Below is a link from Fabspeed. I spoke with them and they claim with their 2011+ Cayenne S Performance Package $2,995 (Maxflo Mufflers with Tips, Secondary Catbypass Pipes, and BMC F1 Air Filters) that you will see 17-20 HP increase. Does this seem reasonable? Anyone have these and verified that claim? How would you describe the sound compared to the factory sport exhaust?

http://www.fabspeed.com/958_cayenne.html