Motorcycle Types Adventure / Dual-Sport 2011 Honda CRF450R: Yoshimura RS-4D

2011 Honda CRF450R: Yoshimura RS-4D

CRF450R Yoshimura Exhaust

The RS-4 muffler was developed in conjunction with the Rockstar Makita Suzuki race team with one purpose in mind: winning championships.

That goal was accomplished during the 2010 AMA Supercross and Motocross season when Ryan Dungey and his Yoshimura-powered RM-Z450 took the motocross world by storm as the first rookie in the history of the sport to dominate both series.

The new RS-4D builds on the technology that has made the RS-4 a force to be reckoned with on the racetrack, enhancing its rock solid performance.

The RS-4D boasts a unique dual-outlet design that increases the amount of open area at the exhaust outlet.

With dual internal baffles, the RS-4D increases the exhaust gas flow rate, resulting in smoother power delivery and increased throttle control, and offers increased horsepower and torque throughout the power curve, especially in the bottom to mid RPM range where riders need it most. The RS-4D is available as a full system, in either Titanium or Carbon Fiber, and comes with an ultra-lightweight carbon fiber end-cap.

The RS-4D has been used by both the Factory Honda and Factory Suzuki supercross teams and is the system of choice for a number of the riders during the 2011 supercross season. RS-4D systems for the 2011 Honda CRF450R are now available.

Click here for applications and updates.

2011 CRF450R RS4D Applications

CRF450R Titanium/Carbon Fiber Full System

  • Carbon Part Number: 225801E220
  • MSRP – $1,095

CRF450R Titanium/Titanium Full System

  • Titanium Part Number: 225801E720
  • MSRP – $1,045

These products are designed, manufactured, intended, and sold for use on vehicles that are operated only on closed course racing circuits unless otherwise noted. Use of these products on public roads or lands is strictly prohibited and may be a violation of local, state, or federal laws. Products intended for use on vehicles operated on public roads or lands are clearly so indicated.

Ron Lieback
Ron Lieback
One of the few moto journalists based on the East Coast, Ron Lieback joined the motorcycle industry as a freelancer in 2007, and is currently Online Editor at Ultimate Motorcycling. He is also the author of "365 to Vision: Modern Writer's Guide (How to Produce More Quality Writing in Less Time).

2021 Indian Springfield Lineup First Look (5 Fast Facts)

There are two motorcycles in the 2021 Indian Springfield lineup, with the standard Springfield focused on longer-distance touring, and the Springfield Dark Horse pulling...

2021 BMW R 18 Review (19 Fast Facts on the First Edition)

Over a year after its concept debut, the 2021 BMW R 18 has made its way to production. Much has been written about its...

2021 Honda CRF450R Review (12 First Ride Fast Facts from Glen Helen)

The 2021 Honda CRF450R is all-new for 2021. The entirely new chassis, bodywork, exhaust, and hydraulic clutch highlight the changes to the CRF450R. Add to...

Arai Spoiler EX2 for the Corsair-X Helmet First Look

The Arai Corsair-X is the Japanese company’s flagship helmet and intended for riders of the highest performance motorcycle. MotoGP racers Maverick Viñales of Monster...

2021 Indian Scout Lineup First Look: Five Models (Photos, Specs + Prices)

Although the five-motorcycle Indian Scout lineup is functionally unchanged for 2021—last year was a major expansion of the line—this year, Indian is offering new...

2020 Ural Weekender SE First Look: Special Edition Sidecar

Just in time for autumn, Ural lets loose with the 2020 Ural Weekender SE. Based on the 2WD Gear Up model, the Weekender SE...