hello again..just need a suggestion...like to get a dinan cai for the x but dinan recommends a software update to along with the cai..do you think it is really necessary or a ploy to get more money for an already expensive cai..i think it is..but being that this is my first bimmer i dont know if by adding the cai that i really need the software update...i have done cai's on american cars with no problem with software issues..any opinions...rob