Max power in various modes

[hixster]

Had what can only be considered a tuned Astra VXR right up my rear on the dual carriage way this evening. Barely keeping ahead by virtue of PDK and he was with a passenger.
I was in sports mode - had I been in sport plus I would have had a bit more punch.

So this led me to thinking - in the Cayman S max power is listed as 325bhp - is this only available in sport plus mode? and what sort of power output am I looking at in sport and normal mode then?