I have been playing with cam timing on my 2005 S3. What normally works for many bikes - retarding the intake cam - gives a little boost above 9000 rpm. This is good for dyno numbers, but not for riding.
Advancing the intake cam gives a nice little boost to the low and mid range - right where we spend most of our time.
The latest engine modeling results seem to indicate that widening the lobe centers 10 degrees (advancing the intake cam 5 degrees, and retarding the exhaust cam 5 degrees) will give a nice boost to the entire powerband up to 8500 rpm, but hurt 9000+. I am going to try this for the next dyno session and report back.
I may be able to play with intake length (adjusting the velocity stack length) to get the best of both worlds.