Kawasaki Ninja 400/Z400 SuperBike Velocity Stacks 2018/2020

$249.99$339.98

The OEM Air box on the Ninja 400 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.

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Description

Spears Racing have developed new, innovative Ninja 400 Velocity Stacks.  Their 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.
The OEM Air box of the stock “commuter bike” Ninja 400 contains two different length velocity stacks, one long, one short and two small intake tracks 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 400 Velocity Stacks 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, Spark exhaust and a power commander five (PCV) vs stock motor with a MWR filter, Spark 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 11,000 but still increases your max RWHP by almost all the way to red line instead of falling off at 9500 and we don’t lose any important midrange power.

Facts:

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.

Dyno Runs by Numbers

SnapStacks Kawasaki Ninja 400 assembly sheet v1

 

**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 400 Kit Contains:

2ea. Air box manifolds
2ea. Spears Velocity Stacks
1ea. Air box template (to modify air box intake) with push pin.

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