Because most 4WD cars will act like FWD cars under acceleration, the CTR2 also shares the Porsche RR layout, one that is renowned for an understeer bias under acceleration (but with a nasty transition to snap oversteer if you don't take care in the non 4WD models). Its quite obvious the static weight bias is in the rear and under acceleration more is shifted to the rear, a lack of load over the front reduces grip (while the increase in load over the rear increases grip at that end) which will result in understeer. Just don't misjudge the corner and back off the throttle, as the sudden shift in load to the front will cause them to bite and the rear to unload, BIG oversteer will result which is difficult to catch.
While I can't 100% confirm the degree of understeer in a CTR2, I can on a TT.
The first generation TT is a notoriously understeer biased car, particularly under acceleration, quite frankly in the real thing its almost impossible to get it to do anything but understeer on the limit, and quite shocking levels of understeer at that. Its basic underpinnings did after all come mainly from the MK IV Golf, which was hardly a dynamic benchmark in its own right.
In regard to Ruf they are both a tuner of customer Porsche's and a manufacturer in there own right (recognised by the German and American governments and the EU as such) and cars they manufacture as Ruf models carry an Ruf chassis number. That is however not a discussion for this thread as its been discussed many times before, so anyone wishing to carry on discussing it or with an opinion to add would be best served with a search for one of those threads.
Regards
Scaff