TST Industries, LLC

TST WORX Airbox for Kawasaki Ninja 400 2018-2023

Sale price$599.99
SKU: N400AB
TST WORX Airbox for Kawasaki Ninja 400 2018-2023
TST WORX Airbox for Kawasaki Ninja 400 2018+ for Non-ABS Models.
What's included in the TST WORX Airbox.
ABS Compatible TST WORX Airbox for Kawasaki Ninja 400 2018-2023.
Developed by the TST WORX Race Team Engineers and thoroughly tested on track.
Pre-installed V2 Velocity Stacks optimize volumetric efficiency for better top-end performance.
Engineered to deliver more airflow to the Kawasaki 399cc engine.
Unique mounting brackets with red anodized hardware for a total WORX design.
Improves top-end power delivery.
Provides a 5.5% increase to area under the curve when paired with the WORX Stage 3 Tune.
Improve the top end power of your Kawasaki Ninja 400 with the TST WORX Airbox.

Upgrade to podium-worthy performance with the TST WORX Airbox. Built from updated premium materials and hand-assembled in our Florida facility, this race-tuned kit includes our exclusive Airbox, Air Filter, and V2 Velocity Stacks that combine to enhance airflow and top-end performance, helping you achieve faster lap times and race day dominance—all at a new, lower price.

We highly advise adding the TST WORX Stage 3 ECU Tune to your order to ensure your ECU is optimized for the enhanced airflow. Send us a stock, untuned, undamaged, and unmodified Ninja 400 ECU, and we'll flash it with our Stage 3 Tune. For best results, consult a tech who specializes in high-performance race bike tuning. Please note that TST ECU Tunes are shipped after we receive and flash your ECU. Any other items in the same order will ship separately on our normal schedule.

This item is not eligible for discounts.


Applications:

Kawasaki Ninja 400 | 2018, 2019, 2020, 2021, 2022, 2023

TST Industries, LLC

TST WORX Airbox for Kawasaki Ninja 400 2018-2023

Sale price$599.99
SKU: N400AB
Select Airbox:Non-ABS

Upgrade to podium-worthy performance with the TST WORX Airbox. Built from updated premium materials and hand-assembled in our Florida facility, this race-tuned kit includes our exclusive Airbox, Air Filter, and V2 Velocity Stacks that combine to enhance airflow and top-end performance, helping you achieve faster lap times and race day dominance—all at a new, lower price.

We highly advise adding the TST WORX Stage 3 ECU Tune to your order to ensure your ECU is optimized for the enhanced airflow. Send us a stock, untuned, undamaged, and unmodified Ninja 400 ECU, and we'll flash it with our Stage 3 Tune. For best results, consult a tech who specializes in high-performance race bike tuning. Please note that TST ECU Tunes are shipped after we receive and flash your ECU. Any other items in the same order will ship separately on our normal schedule.

This item is not eligible for discounts.


Applications:

Kawasaki Ninja 400 | 2018, 2019, 2020, 2021, 2022, 2023

Quantity:
Make an awesome bundle with your TST WORX Airbox for Kawasaki Ninja 400 2018-2023
TST WORX Airbox for Kawasaki Ninja 400 2018-2023 TST WORX Stage 3 ECU Tune For Kawasaki Ninja 400 2018-2023 $885.98

This product is part of our WORX program. Learn more.

This product was designed and intended for closed-course competition use ONLY. This product is neither designed nor intended for use on public roads or land and it is against Federal and State regulations to do so.

Features

  • Replaces the entire stock airbox with a race-developed design
  • 2.5 lbs lighter than the stock setup
  • Bolt-on component - no modification required*
  • Provides 8% increase to peak power compared to stock airbox
  • Provides 5-10% increase in the upper range (9500 - 12500 RPM) compared to stock airbox
  • Carbon fiber and high-strength polymer construction
  • Toray Carbon Fiber Prepreg features a high gloss clear coat for UV protection
  • Includes WORX V2 Velocity Stacks for optimized top end performance
  • Includes specific WORX developed reusable pre-oiled foam air filter
  • Comes pre-assembled and ready for installation
  • Non-ABS and ABS-Compatible versions available
  • TST WORX Stage 3 ECU Tune developed specifically for this airbox - sold separately

*Small tab located on the frame needs to be bent to provide proper clearance for installation.

Description

Our quest for class domination led our engineers to completely redesign the airbox assembly, seeking top-end power gains through a sophisticated new design that combines with our WORX V2 Velocity Stacks and a proprietary reusable open-cell high-performance foam air filter to deliver a 5-10% increase in the 9500-12500 RPM range. When paired with our TST WORX Stage 3 ECU Tune or your own custom tune, the results are instantly noticeable. The WORX Airbox completely replaces the stock setup, including the stock air filter and velocity stacks, and replaces them with specifically designed components that take advantage of the improved airflow and further optimize the volumetric efficiency for better engine performance and faster lap times. Built with uncompromising quality, this Ninja 400 Airbox is unlike anything else on the market.

The WORX Airbox comes pre-assembled, therefore we are not able to substitute items or customize the airbox or velocity stacks per order.

This item is not eligible for discounts.

  • (1) TST WORX Airbox
  • (1) TST WORX Air Filter
  • (1) Set of TST WORX V2 Velocity Stacks
  • Necessary installation hardware

*Airbox, Air Filter, and V2 Velocity Stacks come pre-assembled for ease of installation on your Kawasaki Ninja 400.

Product Feature Episode

Installation

Q: Do I have to do any modification to my bike or airbox?

A: There is a small tab that is attached to the frame that will need to be either bent or removed entirely, depending on your preference. On non-ABS models, this tab is not used for anything and is typically removed by most racers. No modification is required to the stock airbox as this is a complete replacement of the airbox assembly.

Q: Can I use a stock air filter or other aftermarket air filters with this airbox?

A: The air filter that is included with this airbox has been specifically designed to fit within the reshaped design. The stock air filter or any other aftermarket filter that has been designed for the stock airbox will not fit.

Q: How often do I need to clean or replace the air filter?

A: We recommend checking the air filter for visible debris after each race weekend. You can clean and wash the open cell foam filter and re-oil it with your preferred filter oil. If you decide you need a replacement filter, click HERE to order a new one.

Q: If I already have a WORX Tune on my Ninja 400 ECU, can I get the Stage 3 Tune at a discount?

A: Absolutely! We actually offer a free reflash of any previously tuned ECU right HERE. Just pay the $15 shipping and input the original WORX Tune order number and we'll get your ECU reflashed so you can take full advantage of the improved airflow.

Q: How long will it take for me to receive this once I order it?

A: Our handling time is 1-2 business days, and the shipping time varies based on the shipping method selected. To learn more about shipping times, please see the articles in our Terms & Conditions regarding domestic and international shipping here.

Q: I'm located outside of the United States. Will I have to pay duties on this item?

A: Some countries charge additional fees when a package is imported and delivered to the recipient. We have no way of knowing or estimating what these fees will be. It is the buyer's responsibility to cover these additional costs.

Q: What is your return and warranty policy?

A: Please read over our policies thoroughly on our terms and conditions page BEFORE making your purchase. TST Industries Terms and Conditions

Features

  • Replaces the entire stock airbox with a race-developed design
  • 2.5 lbs lighter than the stock setup
  • Bolt-on component - no modification required*
  • Provides 8% increase to peak power compared to stock airbox
  • Provides 5-10% increase in the upper range (9500 - 12500 RPM) compared to stock airbox
  • Carbon fiber and high-strength polymer construction
  • Toray Carbon Fiber Prepreg features a high gloss clear coat for UV protection
  • Includes WORX V2 Velocity Stacks for optimized top end performance
  • Includes specific WORX developed reusable pre-oiled foam air filter
  • Comes pre-assembled and ready for installation
  • Non-ABS and ABS-Compatible versions available
  • TST WORX Stage 3 ECU Tune developed specifically for this airbox - sold separately

*Small tab located on the frame needs to be bent to provide proper clearance for installation.

Description

Our quest for class domination led our engineers to completely redesign the airbox assembly, seeking top-end power gains through a sophisticated new design that combines with our WORX V2 Velocity Stacks and a proprietary reusable open-cell high-performance foam air filter to deliver a 5-10% increase in the 9500-12500 RPM range. When paired with our TST WORX Stage 3 ECU Tune or your own custom tune, the results are instantly noticeable. The WORX Airbox completely replaces the stock setup, including the stock air filter and velocity stacks, and replaces them with specifically designed components that take advantage of the improved airflow and further optimize the volumetric efficiency for better engine performance and faster lap times. Built with uncompromising quality, this Ninja 400 Airbox is unlike anything else on the market.

The WORX Airbox comes pre-assembled, therefore we are not able to substitute items or customize the airbox or velocity stacks per order.

This item is not eligible for discounts.

  • (1) TST WORX Airbox
  • (1) TST WORX Air Filter
  • (1) Set of TST WORX V2 Velocity Stacks
  • Necessary installation hardware

*Airbox, Air Filter, and V2 Velocity Stacks come pre-assembled for ease of installation on your Kawasaki Ninja 400.

Product Feature Episode

Installation

Q: Do I have to do any modification to my bike or airbox?

A: There is a small tab that is attached to the frame that will need to be either bent or removed entirely, depending on your preference. On non-ABS models, this tab is not used for anything and is typically removed by most racers. No modification is required to the stock airbox as this is a complete replacement of the airbox assembly.

Q: Can I use a stock air filter or other aftermarket air filters with this airbox?

A: The air filter that is included with this airbox has been specifically designed to fit within the reshaped design. The stock air filter or any other aftermarket filter that has been designed for the stock airbox will not fit.

Q: How often do I need to clean or replace the air filter?

A: We recommend checking the air filter for visible debris after each race weekend. You can clean and wash the open cell foam filter and re-oil it with your preferred filter oil. If you decide you need a replacement filter, click HERE to order a new one.

Q: If I already have a WORX Tune on my Ninja 400 ECU, can I get the Stage 3 Tune at a discount?

A: Absolutely! We actually offer a free reflash of any previously tuned ECU right HERE. Just pay the $15 shipping and input the original WORX Tune order number and we'll get your ECU reflashed so you can take full advantage of the improved airflow.

Q: How long will it take for me to receive this once I order it?

A: Our handling time is 1-2 business days, and the shipping time varies based on the shipping method selected. To learn more about shipping times, please see the articles in our Terms & Conditions regarding domestic and international shipping here.

Q: I'm located outside of the United States. Will I have to pay duties on this item?

A: Some countries charge additional fees when a package is imported and delivered to the recipient. We have no way of knowing or estimating what these fees will be. It is the buyer's responsibility to cover these additional costs.

Q: What is your return and warranty policy?

A: Please read over our policies thoroughly on our terms and conditions page BEFORE making your purchase. TST Industries Terms and Conditions

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