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Attention: You are purchasing closed course competition Product(s)

I acknowledge that the product(s) being purchased () was/were designed and intended for closed course competition use only. The product(s) is/are neither designed nor intended for use on public roads or land and is against Federal and State regulations to do so. By proceeding with this purchase, I , agree to only use the product(s) for closed course competition.

If an ECU tune was purchased, please send your unmodified and undamaged OEM ECU to TST Industries, located at 623 Pleasant St, Lake Helen, FL 32744.

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U.S. customers are offered a free shipping option for orders with a discounted subtotal greater than $150.00 (before taxes applied). The order's shipment destination must reside within the United States of America. The free shipping options still utilize our standard postage providers and 3rd party shipping companies. Does not apply to large items such as exhausts, stands, and bodywork shipping. All terms and conditions that apply to normal orders will continue to apply to orders with a free shipping option.

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An item returned within 30 days of purchase, that includes an accurate RMA#, in a perfectly new, unopened condition, and that complies with our other return policies, will not be charged a restocking fee.

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The most common product related questions are answered in the tabs section on this page. Be sure to carefully read through the "Product Details", "In the Box", and "FAQs" tabs. In addition, a lot of our products have comprehensive videos demonstrating installations and product features. You can find those videos in the "Videos" tab.

Note: Some product pages may not have all the tabs mentioned above. Please read through all the available tabs to find the answers to your questions. If you still need assistance, please use the "ASK A QUESTION ABOUT THIS PRODUCT" button below the tabs section.
NO ADDITIONAL COST: You pay at the time of checkout and never have to worry again.
COVERAGE: Our Limited Extended Warranty starts on the date of purchase. It covers all manufacturer defects for our TST Exclusive products. (Products manufactured by us with the exception of our WORX products)
EXPERT HELP: As always our team is here to help. If you’re unsure about this warranty or if your product is eligible, feel free to reach out to us and we can help answer any questions you may have!
PRODUCT ELIGIBILITY: TST will offer our Limited Extended Warranty on all products manufactured by TST Industries.
EASY CLAIMS PROCESS: Simply click the “Contact Us” page and fill out the “Returns Form” to begin the warranty process. Once our team receives your email and initiates the RMA, you can send your product back to us and we will repair/replace the product at no cost as long as a manufacturer defect is found. What qualifies as a manufacturer defect? Check out our Terms and Conditions for some examples!

TST WORX V2 Velocity Stacks for Kawasaki Ninja 400 2018-2023 / Z400 2019-2023

  • TST WORX V2 Velocity Stacks for Kawasaki Ninja 400 2018-2023 / Z400 2019-2023
  • Simple and easy installation that does not require any special tools.
  • Increase top-end power of your Kawasaki Ninja 400 with the TST WORX V2 Velocity Stacks
  • TST WORX Velocity Stacks for Kawasaki Ninja 400 / Z400
  • Upgrade your Kawasaki Ninja 400 or Z400 with TST WORX Velocity Stacks.

TST WORX V2 Velocity Stacks for Kawasaki Ninja 400 2018-2023 / Z400 2019-2023

TST WORX V2 Velocity Stacks for Kawasaki Ninja 400 2018-2023 / Z400 2019-2023

Increase top end performance of your Kawasaki Ninja 400 or Z400 with one simple installation. Our exclusive TST WORX V2 Velocity Stacks install without any special tools to provide an awesome 5.8% increase in peak power and overall more performance in the top rev range.

Want to read about the extensive research and development that goes into developing a set of TST Velocity Stacks? Check out our blog post HERE where we break down the R&D that went into developing velocity stacks for our in-house Yamaha R3.

Applications: CLOSED COURSE COMPETITION ONLY

Kawasaki Ninja 400 | 2018, 2019, 2020, 2021, 2022, 2023
Kawasaki Z400 | 2019, 2020, 2021, 2022, 2023

This product is part of our Worx Program!

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SKU N400VS-2=1
TST Industries Kawasaki Ninja 400 2018-2023 Supersport/WORX
TST WORX V2 Velocity Stacks for Kawasaki Ninja 400 2018-2023 / Z400 2019-2023
 
Price: $149.99
Quantity

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If buying this product as part of the Buy Together bundle below, define these options there.

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FOR CLOSED COURSE COMPETITION ONLY

  • Product Details
  • In the Box
  • Recommended Accessories

Features

  • Provides a 5.8% increase in peak power at 10.93 RPM*
  • Designed to specifically provide increased top end power
  • Supersport legal in CCS and ASRA
  • Simple and easy installation that does not require any special tools
  • No modification required for installation
  • Manufactured from chemical-resistant material to withstand gasoline and other harsh chemicals
  • Developed through extensive research and testing by the TST Industries WORX Racing Program

Demonstrated power gains were achieved using a Ninja 400 outfitted with WORX V2 Velocity Stacks and comparing them to the same bike outfitted with OEM velocity stacks.

Description

TST headquarters is home to our 2020 ASRA Moto3 National Championship winning Kawasaki Ninja 400, as well as provides support for other Ninja 400's on the track. In our quest for track day domination on Kawasaki's 399cc supersport, we designed a simple and easy way of adding real performance and power to the engine for that extra edge in performance. Through an extensive research and testing process, we were able to determine the most effective velocity stack lengths for overall power increase using the natural resonant frequencies of the Ninja 400's intake to develop the greatest volumetric efficiency. All of that work has resulted in a 5.8% peak power horsepower gain when compared to the same bike using OEM velocity stacks. That's a significant performance boost that can help you land your race boots on the podium. Installation is an easy bolt-on process, which means that real-world power gains are easy to achieve and leave the ability to return to the stock setup if the need ever arises. Each Velocity Stack set is made from a chemical-resistant compound capable of withstanding gasoline and other harsh chemicals found in the extreme environment of your Kawasaki Ninja 400's engine. Take advantage of hundreds of R&D hours and give your Ninja 400 some extra power with one easy installation by using our TST WORX Ninja 400 V2 Velocity Stacks.

  • Set of TST Ninja 400 / Z400 V2 Velocity Stacks
warning

WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

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Reviews

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(1 reviews)  
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1 Most useful customer reviews (see all reviews):
Macgyver
Apr 21, 2022
Noticeable difference from 2000RPM all the way to 12000, peak power at 10,400RPM, bike feels snappier all the way through the RPM range.
Dyno before the stacks 44HP, after stacks and snorkel removal 46.4HP

Advantages: Easy upgrade if you know how to access your airbox. Gained 2.4WHP on the dyno by adding these velocity stacks and removing the snorkels in the airbox.

Disadvantages: Intake sounds a lot louder due to snorkel removal but worth it
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Reviews

Total Crash Protection Pack for Kawasaki Ninja 400 2018-2023
Total Crash Protection Pack for Kawasaki Ninja 400 2018-2023
No one wants to field test crash protection, but am happy to day that these worked amazingly. Got run off the road into a construction wall, and aside from a chewed up clutch lever and some road rash on the fairings my bike is back in action.
Chris N.
Apr 20, 2024
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