I dunno about that, I'm sure the ecu will compensate to some amount - but if it did the job 100% there would be no reason for ktm to provide a different mapping when one is purchasing their open airbox cover? From https://www.ktm.com/se/powerparts/e...el=F9703R8&category=KE3-16007255/KE4-16007257 "For perfect function, the special tuning/mapping (included) and the Akrapovič EVO exhaust (not included) are required. The tuning kit calibrated specifically for the bike generates more torque and a perceptible increase in performance. Complete with open air filter box cover. Only for the racetrack."