You can find both of those piggyback and flash tuning choices available for the N55 and the choice on which tune to run is totally particular preference. We received’t cover the intricacies of N55 tuning here, but we have prepared focused N55 tuning guides about the two BM3 and MHD https://www.diigo.com/item/note/brz4t/58kx?k=53fccf5d5400dcf7bbfd9a7a3a62b6ac