Spears Racing have developed a new, innovative Kawasaki Ninja 400 and a Yamaha R3 Velocity Stacks. This patent pending revolutionary design is backed by real dyno testing and our Corbin Custom Design engineering staff. Our stacks will improve torque/HP and smooth out power delivery. This allows the rider a truer feel for the throttle which enables more accurate throttle input, improves confidence to get on the throttle sooner and boosts rider confidence.

Dyno proven gains don’t lie! Developed in house on simulation software, the race track and hours on the dyno.

**This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway,competition use only. Not road legal!**

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