Why would you need any of the changes you are talking about if they aren't suggested by the tuner company. Kleeman has been around for some time and I think they would know what these motors can or can't handle. Plenty of other na cars can run boost with minimal or no internal changes. The key is the level of boost.

I do agree with you on one point though. If you have a na xf with an auto, why not just buy an srt6 to begin with. For some of us though, driving a sports car without a manual is a deal breaker.