Yoshimura · AT2
The Yoshimura SOUND INSERT KIT AT2 RACE MUFFLER (INS-37-K) is a replacement service part designed specifically for the YZF-R7 AT2 Titanium Race Full System. Built to fit only AT2 2.375" Titanium Race Mufflers with the "Big Outlet," it provides a race low-volume insert tube solution for riders using that exact muffler outlet size.
This kit is intended for Yamaha YZF-R7 2022–2026 and Yamaha YZF-R7-Kit 2022–2025 applications as listed in the fitment table. It is identified by part number INS-37-K and is a non-spark arrested insert kit for the AT2 series.
Fitment
Engineered exclusively for AT2 2.375" Titanium Race Mufflers with the "Big Outlet." It will NOT fit standard AT2 (2.25”) muffler outlets, helping ensure the insert matches the correct outlet size for the intended AT2 muffler configuration.
Sound
Includes a race low-volume insert tube designed for use with the YZF-R7 AT2 Titanium Race Full System. This kit offers a purpose-built insert option for riders running the AT2 series race muffler setup specified in the listing.
Installation
Kit includes the race low-volume insert tube, end-cap collar, and set screw. With these components provided together, the insert setup is supplied as a complete package of the listed parts for the AT2 "Big Outlet" muffler.
Fitment
This sound insert kit is clearly defined by outlet compatibility: it only fits AT2 2.375" Titanium Race Mufflers labeled "Big Outlet" and will not fit standard AT2 (2.25”) muffler outlets. Matching the outlet size is essential for proper application, so riders should verify they have the correct AT2 muffler type before selecting this insert kit.
Included
INS-37-K is supplied as a kit with the components listed by Yoshimura: a race low-volume insert tube, an end-cap collar, and a set screw. It is also specified as non-spark arrested. For additional guidance, the page includes an installation PDF link where available.
| Part Number | INS-37-K |
|---|---|
| Brand | Yoshimura |
| Product Line | Replacement Service Parts |
| Series | AT2 |
| Shipping Weight | 1 lb |
| Barcode | 00840025914506 |
| Make | Model | Model Years |
|---|---|---|
| Yamaha | YZF-R7 | 2022–2026 |
| Yamaha | YZF-R7-Kit | 2022–2025 |
Fitment as listed by Yoshimura for part number INS-37-K.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
