Yoshimura R&D of America, Inc.

CRF450X 19-26 RS-4 Stainless Full Exhaust, w/ Aluminum Muffler

CRF450X 19-26 RS-4 Stainless Full Exhaust, w/ Aluminum Muffler - Main image
$591.57 $939 In stock

Category: Enduro Series Exhaust System

Red Rider off-road fans can now rejoice as Honda has now released their CRF450X. A serious offering to take on the 450cc off-road category.

As soon as we got our hands on the CRF450X we rolled up our sleeves and went to work. The goal - improve power in every area we could while keeping the goal making the new 450X easier to ride in a variety of off-road conditions. We tailored the power delivery to give the machine more usable rideablity. Power is up and weight is down for a win-win situation for the new red off-road machine.

Benefits for the CRF450X Yoshimura RS-4 system include:


  • Big power gains with both full system
  • Massive weight reduction with full system 
  • A USFS spark arrester is included

If your serious - it's only Yoshimura. Proudly made in the USA!

Sound Insert/Spark Arrester Options

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Sound Level

Volume Insert Spark Arrestor Included
INS-22-K Yes
SA-04-K Yes
INS-13-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 (5.0 / 5 · 5 reviews)

Joshua C. ★★★★★

Installed it over the weekend and the aluminum muffler shaved off noticeable weight. Throttle response is crisper through the mid-range on my '21 X.

Grace P. ★★★★★

Bike sounds completely different now—deeper and throatier, and the aluminum muffler saves noticeable weight over the stock can. Install took a bit of fiddling with the mounting brackets, but the stainless header fits perfectly and the end result is worth every minute.

Elizabeth Q. ★★★★★

Fired up my 450X after bolting this on and the midrange pull is noticeably stronger — it just keeps pulling where the stock pipe flattened out. The aluminum muffler is louder than I expected, but in a throaty way that doesn't drone on long trail rides. Fitment was spot-on, no rejetting drama.