ZCS Tuned

Huge thanks to our customers and fellow racers, big order going out today for a few race bikes! Two Superbike spec Ninja 400's and an all-out Ninja 500 with a joint developed overbore kit installed, all of which will be club racing this season and gridded up for RoC in Daytona!

Unfortunately, this means that these industry leading overbored throttle bodies are now out of stock until next production run is completed. Please do not hesitate to reach out for updates.

Over the last couple of years, we have been quietly supporting customers and racers here with all current products. What began as a hobby has now become a full-time profession, contributing at the OE level with a major motorcycle manufacturer to continue to push the boundaries of performance.

Partnerships have been built, races won, and opportunity lies ahead. The ZCS team wishes the best to you and yours in 2026! Thanks again for your support!

We've had some great questions since releasing the ZX-4RR ECU flash and Velocity Stacks products! Please feel free to browse our new Downloads and Writeups page to find more information around how our velocity stacks work, the goals that were targeted when designing them, how they are constructed, and how they will work for you!

Link: https://zcstuned.com/downloads-and-writeups

TL;DR - We are targeting maximum power gains within the usable rpm range during maximum acceleration!

Thank you all for the amazing support and interest in our ZX-4RR ECU flash and Velocity Stacks products! Here's order #5 packed and ready to ship out! We're feeling generous and so we're going to extend the "50%stacks!" discount code for another 5 orders!

That's right, $275 TOTAL for a custom ECU flash as well as velocity stacks, all with INDUSTRY LEADING free shipping for the entire transaction! We ship you all materials to ship us back your ECU, postage pre-paid! No fussing with putting together your own shipping materials and finding time in your busy schedule to stop at a shipping center.