Air and Fuel› Air Cleaners, Filters, Intakes and Components

TST WORX

V2 Velocity Stacks

$149.99

SKU: N400VS-2

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

The TST WORX V2 Velocity Stacks are designed to increase top-end power on your Kawasaki motorcycle.

These velocity stacks are specifically designed for the Kawasaki Ninja 400 from 2018-2023 and the Z400 from 2019 onwards. They are intended to be part of a performance package, often paired with aftermarket exhausts and ECU tunes to maximize their benefit.
Show original supplier description
The TST WORX V2 Velocity Stacks are a performance-enhancing upgrade for the Kawasaki Ninja 400 (2018-2023) and Z400 (2019-). These stacks were developed through extensive research and testing by the TST Industries WORX Racing Program to unlock hidden performance potential and provide a competitive edge. TST Industries has determined the most effective lengths for these velocity stacks to provide a significant performance boost. The product description highlights a 7.69% peak horsepower gain when compared to OEM velocity stacks on a Ninja 500. Features include a simple, bolt-on installation process with no required modifications, allowing for easy return to stock configuration if needed. The stacks are manufactured from a chemical-resistant compound, capable of withstanding gasoline and other harsh chemicals commonly found in the engine environment. The easy, tool-free installation makes achieving real-world power gains accessible. 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.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandTST WORX
Part NumberN400VS-2
CategoryAir and Fuel

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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