The 2025 Honda CRF450R has been unveiled, and has already won the 2024 SMX Championship under Jett Lawrence and taken second place in SMX under Jett's brother Hunter! When it comes to Honda Motocross Racing exhaust systems nobody even comes close to Yoshimura R&D of America.

The newest CRF450R boasts a new chassis, airbox and ECU configuration. Yoshimura engineering and development team has had their nose to the grindstone with Team Honda HRC to squeeze every drop of performance out of the new 450. With their new RS-12 Signature Series titanium full system, they achieved a max HP gain of 3.7% over stock while the max torque gain came in at 1.3%.

Some of the features of the new RS-12 include:

Hydroformed Muffler

• This is the first of a new generation RS-12 profile exhaust system featuring weight reducing hydroformed technology. This technology allows to maximise available space for a tailored fit while minimising material usage. Hydroforming removes many of the limitations of conventional metal forming methods allowing for a stronger and lighter muffler. This new sleeve also incorporates a deep draw one-piece resonator further improving durability.

Hydroformed Header Primary

• Improved performance due to exact matching of the oval exhaust port, with a smooth internal transition from oval to round. Increased durability from a reduction in welded connections. Improved fit from the exact repeatability of hydroform process.

Header Resonator

• Developed in cooperation with the Honda HRC Team, Yoshimura header resonator isn't just there for looks, it allows them to maximise power across the spectrum, while enhancing rider connectivity.

Cast Manifold

• Benefits include increased strength, durability, easier installation and removal.

The new RS-12 for the 2025 Honda CRF450R/RX also comes with an INS-32-K sound insert installed. This insert not only produces an ear pleasing exhaust note, it also makes the best power for the new Honda.

CRF450R RS-12 is designed, developed and made in the USA with the help of Team Honda HRC race teams in the USA and Europe.

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

ADDITIONAL INFORMATION

VIEW INSTALLATION INSTRUCTIONS

BIKE FITMENT

HONDA

• CRF450R 2025-2026
  
• CRF450RX 2025-2026