Yoshimura 231010D321 Signature RS-4 Full Exhaust System For Yamaha YZ250F / FX (2014-)

Yoshimura’s 231010D321 Signature RS-4 Full Exhaust System, SS-AL-CF(Stainless Steel, Aluminum, Carbon Fiber) is made specifically for Yamaha YZ250F (2014-current) & YZ250FX/WR250F (2015-current).

Yamaha’s YZ250F is the choice of many rippers in the 250 class. Yoshimura, in our endless endeavor to make the best, most usable power, we have refined our Yamaha YZ250F full systems. Our new RS-4 systems deliver 12% peak HP and 11% peak torque while enabling the YZ250F to have a more linear, more usable power curve. With our new systems the blue machine is much easier to handle while providing more power! That’s a win/win in anyone’s book.

The work that went into developing the RS-4 muffler has paid big dividends in Off-road Racing; winning multiple Supercross and Motocross titles since it’s inception. We’ve developed the current generation RS-4 based on that research & development, and the result is a unique design that provides an unrivaled combination of power and quiet exhaust tone. The RS-4 features a Polyresonant duplex chamber and two-staged stepped baffle for increased performance, while a carbon cone end cap finishes off its innovative styling.

• Pentagonal-shaped sleeve
• Front muffler cap functions as a polyresonant chamber which helps reduce noise
• Two-stage stepped baffle
• Carbon fiber end-cap
• Stainless steel header and tail-pipe
• Repack Kits, optional Inserts are available for all models

Signature Series: Introducing Signature Series by Yoshimura – an offering of exhaust systems that a dealer can install with confidence. Our Signature Series lineup is the answer for today’s dealer who is faced with a challenging marketplace. The applications for the Signature Series line cover the entire powersports spectrum, including many of our off-road applications. Everyone of our Championship Winning Motocross exhaust systems and nearly all of out ATV/Side-by-Side applications are all members of the Signature Series Family. All Signature Series components are tested, documented, and marked as required by federal and state regulations.