For all those interested, I am putting together a NorCal group tuning day(s) and the tunes will be performed by RK Tunes, one of the premier BMW DME tuners in the US. I am starting this because I need a good, safe tune on my S/C 540i. I have done a lot of research and Jordan of RK Tunes is the man. City and date is open for discussion. Thanks. Jordan comes highly recommended by many shops and BMW owners.