Agreed I think that tuners are just at the tip of the iceberg with the N54 and its potential. However, people are already starting to find the "bugs" in the 335, I have read on several different occasions about the cars actually starting to overheat
http://forums.audiworld.com/lrqc/msgs/84866.phtml
Hope it is just a fluke, but if I was a 335 owner I would keep a close eye on on it as a potential problem.