becasue they crank up the correction on their dyno, so the numbers inflate. Its marketing to idiots.
thats why albany speeds dyno “reads low” beasue its set to or damn close to zero. tuning aid, not dick measuring tool.
Lets all keep in mind this is a street bike, NOT behind ridden by Antron Brown. There is absolutely no reason o tune, or run a bike so close to lean that 3 seconds of a glitch in the system melts a piston, puts you on the side of the road or worse ON THE ROAD. Leave the the hell alone if you actually want to ride it and resell it later. We are not talking a highly modified track prepped bike, why are we making this out so much harder then it needs to be?
download the damn tune. Flash the close enough one on there. Pull it once. read graph, make competent decisions as to what and where to change, pull again and repeat process. then dial it back a touch for safety, peace of mind and reliability.