Yoshimura · AT2 · Full System
The Yoshimura AT2 Race Series Exhaust System is a stainless full system built for Kawasaki Ninja-650 2017–2026 and Kawasaki Z650 2017–2026. Designed to sharpen the bike’s overall presence, it combines the AT2’s aggressive shape with a distinctive Yoshimura sound character.
This system uses a stainless steel header and tailpipe and is finished with Yoshimura’s exclusive Works Finish. It’s engineered for maximum flow and improved ground clearance, with durability and serviceability in mind. Fitment details and supporting media like the dyno chart, product video, and installation PDF are provided on the page for quick reference.
Sound
The AT2 muffler design focuses on a modern, aggressive profile paired with a unique sound note. A facet-formed tip gives the system a distinctive look that stands out as a Yoshimura R&D design detail, complementing the Ninja-650 and Z650’s sharp middleweight twin-cylinder character.
Fitment
Yoshimura builds this Race Series system with improved production tolerances to deliver consistent fit and high-end finish. The result is a stainless full system intended to install cleanly and look precise on the bike, aligning with the AT2’s premium design direction.
Performance
The AT2 full system is optimized for maximum flow and improved ground clearance, helping support performance-minded setup choices. It’s also designed for durability and ease of service, making routine access and long-term ownership considerations part of the overall package.
Engineering
Yoshimura positions the AT2 as a Race Series full system shaped by decades of hands-on experience and modern digital design capabilities. This stainless configuration uses a stainless steel header and tailpipe, paired with Yoshimura’s exclusive Works Finish. Improved production tolerances are emphasized for “unrivaled fit and finish,” reflecting the brand’s focus on consistent build quality and a refined end result on the bike.
Sound
This system includes the INS-20-K sound insert. Yoshimura notes sound levels are measured using J2825 standards with the INS-20-K low volume sound insert, and the page also shows additional sound insert options in the insert table. For riders who want a clear view of what’s included and what’s optional, those details are presented alongside the system’s supporting sound information.
Fitment
The AT2 Full System is specified for Kawasaki Ninja-650 2017–2026 and Kawasaki Z650 2017–2026. To streamline installation planning, the page provides the fitment table plus an installation PDF, along with a product video and photos to help confirm routing and overall appearance. Always verify the exact model and year match using the fitment table shown on the page.
| Part Number | 14651AM521 |
|---|---|
| Brand | Yoshimura |
| Product Line | Race Series Exhaust System |
| Series | AT2 |
| System Type | Full System |
| Material | Stainless |
| Sound Insert (Included) | INS-20-K |
| Shipping Weight | 16 lb |
| Barcode | 00840025915602 |
| Emissions Compliance | QUALIFIED MANUFACTURER DECLARED "MODIFIED PART" |
| Make | Model | Model Years |
|---|---|---|
| Kawasaki | Ninja-650 | 2017–2026 |
| Kawasaki | Z650 | 2017–2026 |
Fitment as listed by Yoshimura for part number 14651AM521.
| Part Number | Type | Included With This System |
|---|---|---|
| INS-20-K | Sound Insert | Yes |
| INS-35-K | Sound Insert | No |
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
