Velocity Stack Kawasaki Ninja 300 Superbike/Supersport Kit 2013/2017


The OEM Air box on the Ninja 300 contains two different length velocity stacks, one long, one short and two small intake tracks which limits the air intake into the engine, again remember this is a commuter designed motorcycle.


Spears Racing has developed a new innovative Kawasaki Ninja 300 Superbike Velocity Stack kit.  This innovative  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.
The OEM Air box of the stock “commuter bike” Ninja 300 contains two length velocity stacks, and one small intake tracks (right Rear of the Air box door) which severely limit the air intake into the engine.  This kit replaces both stacks with our own Spears Racing shorter velocity stacks and instructions to modify your current OEM air box.  These shorter velocity stacks not only allow more air into the engine, but they also smooth out the increased flow of air to really maximize the benefit.

The performance difference with the Spears Racing Kawasaki Ninja 300 Velocity Stack kit compared to the stock is dramatic.

Here’s a dyno comparison with a stock motor(OEM),stock air box vs stock motor with a MWR filter, Yoshimura R-77 exhaust and a power commander five (PCV) vs stock motor with a MWR filter, Yoshimura exhaust and a power commander five (PCV) modified air box (snorkels removed) with Spears Racing’s velocity stacks. You can see the power band carries strong through the complete power and noses over after 12,600 but still increases your max RWHP all the way to red line instead of falling off at 12,000 and we don’t lose any important midrange power.

“Never Copy…Always Create your own”


These dyno runs were done with 30PSI in rear tire
This ECU is not flashed or any hidden items to show false readings.

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

*** The Difference between the Superbike and the Supersport Velocity Stack kits is the Air Box Modification***
Kawasaki Ninja 300 SB assembly Install
Kawasaki Ninja 300 SS assembly Install


**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!**


Spears Racing Kawasaki Ninja 300 Superbike Velocity Stack Kit Contains:

2ea. Air box manifolds
2ea. Spears Velocity Stacks
1ea. Air box template (to modify air box intake) with push pin.
1ea.Rubber block off plug
1ea. m6 Allan head bolt
1ea tube silicone

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