I wish I had ran her up when I had my Cobra Swept pipes on, but with these straight thru Graffeo pipes and the Dyno made a big difference. I'm sure with Ivans flash I'll get another 5 or 10 more on my Speedo. I'll let ya knowWay back on a Mexico road south of Yuma some of us hit ~134 as registered on a compadre's sport bike speedo but no GPS. Some of that was speedo error of course. A couple years later in Southern Arizona I was GPS clocked at ~124 (a sanctioned event). That was pre-Ivans. I know that with Ivan's and 2-2 or 2-1-2 you can get ~130+ and far less vibration.
Challenges are vibration, wind, feet-on-pegs, keeping helmet visor down. The bike prefers fairly straight lines above ~100 but with a 190 rear I'm told it improves high speed sweepers.