You'll find both of those piggyback and flash tuning solutions accessible for the N55 and the choice on which tune to operate is fully particular choice. We gained’t address the intricacies of N55 tuning below, but we have written devoted N55 tuning guides about equally BM3 and MHD N55 flash https://docs.google.com/forms/d/e/1FAIpQLSdYQtsIIjKr70jJngfUvvEIQ2bNCs0Kcer3lQuPGn_vWTdgZA/viewform