Was hoping that the RS660 would sort of be a "luxury Ninja", but it's not quite that. The engine is tuned to come alive at 7.5K+, and there looks to be less power under that rpm than the Ninja (but it destroys the Ninja above that). Maybe the RS660 has shorter gearing, but I bet not, since it revs higher -- it's probably got longer legs, making the torque deficit even worse off the line. Yeah, I scraped the dash rpm/kph from a video, Aprilia 1st gear just slightly taller about 3%. The Ninja is punching 15% more at 19 mph in 1st gear. The Aprilia doesn't approx match the Ninja until 35 mph (from dyno curves). By the time the Aprilia catches the Ninja, it's going to be 45+ mph realistically. I don't think the RS660 unseats the Ninja as the best twin street bike. I was all excited for the RS660, but then I saw the dyno curve, it's sporty, mellow then beasty. I was hoping for a more torquey characteristic, but I guess that was an silly idea, given that it revs 2K more than the Ninja.