Spoke to the experts here about getting another mods such as the induction kit, turbo delete valve, air filter etc... to further improve performance. They reccomended against this as it would affect their warranty terms on the car they offer. He also said that there is no clutch slipping going on per se as ABT in Germany as aware of the anecdotal experiences of this from other users of other tunes. What he said is really going on is the haldex process is working more than if the standard set up is in play. This gives the feeling of the clutch slipping and all that is happening is that the car is reducing revs to allow power to distribute amongst the wheels. I'm paraphrasing here and the ABT guys have already tested for actual clutch slippage and say it is not happening. In other words they said do not get any other additional tunes done as it will interfere with the ABT box.