There are actually each piggyback and flash tuning solutions accessible for the N55 and the choice on which tune to run is solely personalized desire. We gained’t address the intricacies of N55 tuning listed here, but We've penned devoted N55 tuning guides about both of those BM3 and MHD N55 https://www.houzz.it/ideabooks/185374641/list/turbo55