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Thursday, April 1, 2010

Yoshimura’s RS-4 Available for the 2010 Yamaha YZ450F

April 1, 2010 – Chino, Calif. – Yoshimura has announced the RS-4 Exhaust system in both Slip-on and Full System configurations for the Yamaha YZ450F. The RS-4 features a Yoshimura duplex chamber that cancels out negative exhaust pulses and acts as a sort of mechanical baffle before the actual perforated baffle area. This improves overall power while lowering the sound emission.

RS-4 Comp Series Slip-on

This pipe has a stainless/aluminum muffler construction with a carbon fiber tip and a 96dB spark-arrested insert. Other optional inserts available for this pipe are a motocross 99dB non-spark arrested version, and a 94dB motocross non-spark arrested. The stainless tailpipe bolts right onto the stock header for easy installation.

RS-4 Comp Series Full Systems

The RS-4 Comp full system features a stainless/aluminum muffler construction with a carbon fiber tip. The muffler is spark arrested with a 96dB insert. An optional 94dB spark-arrested insert is also available. If you’re looking for non-spark arrested options, there are motocross inserts in either 99dB or 94dB (which is AMA legal).

RS-4 Pro Series Full Systems
With full titanium construction, the RS-4 Pro Series comes with your choice of either a carbon fiber or titanium muffler. Either way, the RS-4 comes with a carbon fiber tip. The muffler comes standard with a non-spark-arrested motocross insert at 99dB, but an AMA-legal 94dB insert is also available.

YAMAHA - YZ450F – 2010
RS-4 Stainless/Aluminum Slip-On
Price: $395.00

YAMAHA - YZ450F - 2010

RS-4 Stainless/Aluminum Full System
Price: $645.00

YAMAHA - YZ450F - 2010
RS-4 Titanium/Titanium Full System
Price: $995.00

YAMAHA - YZ450F - 2010
RS-4 Titanium/Carbon Fiber Full System
Price: $1,045.00

About Yoshimura R&D of America: Yoshimura is “The Leader in Performance” and has been for more than 55 years. With unmatched skills, knowledge, and passion for racing, Yoshimura is on the forefront of the aftermarket exhaust industry. Yoshimura pipes are race bred and feature the same legendary performance, fit and quality that has been their trademark for more than five decades. To learn more about Yoshimura and view the wide variety of performance products, visit

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