Christian, I am sure that you will agree that there must be some other better or best way to do the job of preheating the cat without this unfortunate delayed shift and hard knock as it does it. Tell me why nobody has followed this wierd way if it is really necessary(to preheat the cat for whatever reason) and why nobody is complaining about this crazy invention in any other car? Thats because they had better engineers who thought of better ways thats why. So simple. Their most important requirement was for a smoothly changing gearbox all the way. Nothing else was to get in the way.