does anyone know who makes such? just found out today that all the software company's bs (not trying to talk smack) about stealership not being able to detect due to the fact that it is a flashing procedure, and no physical tamper does not mean it is stealth. found out from few good friends of mine who are actual master tech from couple bmw stealerships locally in socal. turns out piggyback system would be the safest bet, they said that it has more potential of covering up "just in case" if something goes wrong. never know... just wanted to know if anyone knew of any company out there. of course this is for all the sake of warrenty.