They never answer that question. They did a ton of 17 and 18 bikes at one time 650IB brought them, some with the arrow and some with Akra and dynoed them over a couple of days. They say the Akra makes a few more peak HP but wont answer about the midrange power between the Akra and Arrow shorty. Maybe because they sell the Akra and not the Arrow.You peaked my interest, do you have any supporting documents of anything else on the market compared to Akrapovic? Same bike/day dynos? It's a bold statement to make. I'd love to read or watch the proof. Don't get me wrong, I'm a Akrapovic fan but surely someone has to be just as good.