The bike has 21,000 on it. Before 18,500 miles it ran as a brandnew bike. When it hit 18,500, the bike started running as if it feels like it's starving for fuel, or air. I just had he valves checked, new plugs, and air filter's clean. The only mods I have are Akrapovic bolt on, and PC3usb. The map I'm running is the same I've been using before it started this issue. The bike still gets up and moves, except, when it gets above 4500 rpm. That's when it starts to feel like it won't top out. Has anyone had this problem?

Thanks

Justin