Yoshimura R&D of America, Inc.

YZ450F 2026 RS-12 Stainless Slip-On Exhaust, w/ Aluminum Muffler

YZ450F 2026 RS-12 Stainless Slip-On Exhaust, w/ Aluminum Muffler - Main image
$395.89 $649 In stock

Category: Signature Series Exhaust System

Our brand-new offering for the 2026 Yamaha YZ-450F is ready for action. Introducing the RS-12 Signature Series Slip-On—lightweight, compact, and built to deliver serious power.

This RS-12 is USFS approved and comes equipped with a spark arrestor installed, so you’re ready to ride the woods or trials right out of the box.

Featuring a stainless steel mid-pipe paired with an aluminum muffler and finished with a matte carbon fiber end cap, every detail is built for performance and durability.

Proudly engineered, developed, and built in Chino, CA.—Yoshimura quality you can count on.

Sound Insert/Spark Arrester Options


Sound Level

Volume Insert Spark Arrestor Included
SA-21-K Yes
SA-20-K No
INS-33-K No 
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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

George ★★★★★

The install took about twenty minutes with basic tools, and the RS-12's compact size makes the rear end feel noticeably lighter when I'm flicking it through tight corners. USFS approval is a nice bonus for the places I ride.

Julian G. ★★★★★

The aluminum muffler shaved noticeable weight off the rear, and the bike feels snappier through the mid-range. Installation was straightforward, bolting right up to the stock header with no fitment issues.

Emma T. ★★★★★

The new muffler is noticeably lighter than stock, and the aluminum body looks great. Fitment on my 2026 bike was perfect with no modifications needed.