The JB4 for S63TU has been out for a while with good results documented across various forums. I know of 2 S63TU cars (both M5s) running JB4 without issues. Not sure if anyone has done flashes locally (a lot more expensive if overseas is anything to go by), but I think Craig at NXGen can do the AMS flash, turbos and downpipes (probably for the same price as an E46 M3 :crazylaugh: ) Again not sure that one has been done yet. When I bought my car I thought I'd do JB4 but I haven't felt the need so far