With just the pipe, air filter, and Bazzaz unit the power fell off abruptly beyond 8200 rpm, but now the zenith is flatter and the power is sustained longer. Peak output with the airbox in place is 25.9 bhp at 8100 rpm, and remains within 0.5 bhp of that figure for 2000 rpm. The bike breathes much better through a velocity stack, and in Superbike trim the CBR puts down 27.5 bhp and remains strong all the way to the new 10,800-rpm rev limit. If that’s not impressive, I’ll eat a piston. I’ll detail the engine mods—and provide a full race report from the upcoming AFM event at Infineon Raceway—in the next installment.