Will the dealer replace injectors under CPO warranty? Not that I think I need to replace mine, but for future reference. Although I've also been experiencing similar symptoms to those of the OP. Will be changing my plugs soon..
'08 E92 335Xi - Premium, Cold and Sports Packages
JB4 // AFE DCI // Matte Black Grills // MTEC Angel Eyes // CF Mirror Covers // Forgestar F14's