My recommendation is do not _touch_ the CAS. It is not worth the very little gain in power for all the trouble it will cause.
See the following discussions:
http://www.emergent.com.au/mailarchives/sx...0/msg00697.html
I've had it done and adjusted back to normal. You risk causing engine damage. My opinion is that anyone that advances the CAS to increase power on a late model turbo car has no idea what they're doing.