The #1 exhaust in Supercross and Motocross that powered Chase Sexton to the 2023 450 Supercross title, and Jett Lawrence to the 2023 450 Motocross SMX title and perfect season!

In the never ending pursuit to craft the very best exhaust system, Yoshimura introduces the latest RS-12 stainless steel system for the Honda CRF450R/RX.

Why did they go through the task of introducing a whole new system for the CRF450? With the latest engine spec, their engineers wanted to get the best most usable power from this new model. This new system incorporates a one-piece stainless steel cast manifold featuring an integrated bolt flange surface that is 3x stronger than conventional designs.

This new system has been developed with - and is the closest thing to what 5x World Champion Tim Gajser, Chase Sexton, Jett Lawrence have been using to grab holeshots and win championships. By increasing the resonator in the RS-12 muffler by 50cc (a 14% increase) and adding a second resonator to the header, their engineers were able to unlock some insane usable power from this new and improved system.

The new RS-12 system adds 5% max hp and 6.5% max torque to the new engine spec with its smaller throttle body and different ECU settings.

What does this translate to?

• Easier power delivery
• Smoother frontside torque
• Allows the rider to ride in an higher gear, thus freeing up suspension.
• Less rider fatigue

RS-12 Features and benefits:

• Aggressive intelligently designed, the RS-12 asymmetrical shaped muffler allows maximise capacity and incorporates a resonance chamber for managing sound and increasing usable power. RS-12's unique profile also provides more clearance for tyre and brake calliper.
  
• Improved performance gains with refined linear power delivery.
• Just like the works systems our Factory Racers use, RS-12 systems utilise precision machined joints. Machined joints provide a superior and exacting fit for joints by better securing the seal between two surfaces with a perfect 360 degree contact surface which translates into improved system life, fit and performance.
• New patent pending Precision Taper Fit (PTF) insert ring makes it easy to install and remove sound inserts and spark arresters.
• Works-look matte carbon fibre end cap with industry leading design, innovation and detailing as expected from Yoshimura.
• Carbon end cap covers the RS-12 inner cap, thus improving looks, while providing easier service as compared to other sandwich mounting designs most commonly found in the industry.
• Proudly designed, developed and made in the USA!
• Repack Kits, optional Inserts and Spark Arresters are available for all models

VIEW INSTALLATION INSTRUCTIONS

BIKE FITMENT:

HONDA

• CRF450R 2021-2024
  
• CRF450RX 2021-2024