Ninja400R Kawasaki Ninja 400 18-23 Race Spec Velocity Stacks

The OEM Airbox in the Ninja 400 contains two different length velocity stacks, a long one and a short one. This kit replaces both stacks with our own spec shorter velocity stacks designed by Jeremy Toye. The performance difference with the Superbike Velocity Stacks compared to the stock is dramatic. The power curve with the stock setup falls off pretty fast after 10,500, but with our velocity stack setup, it continues to climb all the way to 11,800, maximizing power for high RPM track use.