Graves Kawasaki ZX-4RR Velocity Stacks
Graves Motorsports Kawasaki ZX-4RR Velocity Stack Kit. Developed by our multi time championship winning racing engineers. No cutting / altering / bonding required. These stacks straighten out the power curve while improving low, mid and top end torque and horsepower. Designed to smooth out the power curve, increase horsepower throughout and improve fuel efficiency.