Kawasaki Ninja 400/Z400 SuperBike/Supersport Velocity Stacks 2018/2020
$279.99 – $369.98
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.
The performance difference with the Spears Racing Kawasaki Ninja 400 Superbike/Supersport 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, 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.
These dyno runs were done with 30PSI in rear tire
This ECU is not flashed or any hidden items to show false readings.
Non Race 89 Octane Fuel (Gas Station)
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***
Superbike Install Below
Supersport Install Below
**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 Superbike/Supersport Velocity Stack Kit Contains:
2ea. Air box manifolds
2ea. Spears Velocity Stacks
1ea. Air box template (to modify air box intake) with push pin.