Yoshimura 225860S520 2025 Honda CRF450R / CRF450RX RS-12 Full Exhaust — Elite Power & Response

Yoshimura — Elite-Level Power Delivery, Control the Raw Grunt of the New CRF450R

The 2025 Honda CRF450R is a powerhouse, but managing that much displacement requires a high-efficiency exhaust path to prevent the powerband from feeling "jerky" or unrefined. Many riders find the stock system can be restrictive, causing heat buildup and a lack of throttle precision in the mid-range. The Yoshimura RS-12 Full System is the definitive upgrade, specifically engineered to smooth out power delivery while boosting peak horsepower and torque, giving you the confidence to carry more speed through technical rhythm sections.

Built using decades of factory racing data, the RS-12 features "Factory Quality" precision-machined joints that provide a superior 360-degree seal, ensuring maximum exhaust velocity and durability. The aggressive asymmetrical muffler profile increases internal volume to manage sound without sacrificing performance, while simultaneously offering increased clearance for the rear brake caliper and tire during deep suspension travel. With its tapered inlet design, the RS-12 centralizes mass, making your Honda CRF450RX feel lighter and more balanced on the track or trail.

• Proven Horsepower Gains: Maximizes exhaust flow for a broader powerband and improved throttle response.
• Factory Quality Machined Joints: Exacting fit that better secures the seal between surfaces for improved system life.
• Asymmetrical RS-12 Profile: Maximizes capacity for power gains while providing massive caliper and tire clearance.
• PTF Insert System: Patent-pending Precision Taper Fit ring makes swapping sound inserts or spark arresters effortless.
• Works-Style Carbon End Cap: Matte finish with an inner-cap mount for enhanced durability and easier repacking.

Moto-House MX Pro Tip:

The 2025 Honda CRF450R exhaust flange utilizes a specific gasket that can be crushed if the header isn't seated perfectly flat. When installing your RS-12, ensure the header is fully flush against the cylinder head before tightening the flange nuts. Tighten them in small increments, alternating between nuts, to apply even pressure. This ensures a "Factory Quality" seal and prevents the exhaust pops often caused by minor air leaks at the head.

Year	Make	Model
2025	Honda	CRF450R
2025	Honda	CRF450RX

FAQ Questions

Q) Does this system help with the 450's aggressive throttle snap?
A) Yes, the RS-12 is designed to refine the engine character, providing a smoother, more manageable power delivery while still increasing total horsepower.

Q) Is this system lighter than the stock Honda exhaust?
A) Yes, by utilizing high-grade stainless steel and an aluminum muffler with a carbon end cap, the RS-12 reduces overall weight compared to the stock unit.

Q) Can I run a spark arrester in this for off-road use?
A) Yes. While this is a competition system, the PTF insert ring allows you to easily install a Yoshimura spark arrester (sold separately) for trail riding.

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