Yoshimura CF Moto 450SS 2023-2025 Exhaust Stainless Steel Slip-On | AT2 Street Series

Transform Your CF Moto 450SS Performance

The Yoshimura AT2 Street Series slip-on exhaust is the first major-brand aftermarket exhaust engineered specifically for the CF Moto 450SS and 450NK. Designed for new CF Moto owners seeking measurable performance gains without sacrificing street legality, this system delivers 6.3% horsepower increase and a dramatic 10% torque gain—making your 449cc parallel twin sound and perform like a bike 200cc larger. Street legal in all 50 states with EPA-compliant emissions and appropriate noise labeling, this bolt-on upgrade requires no tuning, no cutting, and no modifications to your bike's emissions system.

Authorized Yoshimura Dealer - Genuine parts backed by full manufacturer warranty and expert technical support.

Performance Specifications

Dyno-Verified Power Gains

• 6.3% maximum horsepower increase - Measurable top-end power improvement
• 10% maximum torque gain - Dramatic mid-range punch for street and track riding
• Nearly 50% weight reduction - Significantly lighter than stock CF Moto exhaust
• Enhanced throttle response - More aggressive power delivery throughout the RPM range

Sound Improvement

Experience a deep, aggressive exhaust note that rivals premium European sport bikes. Riders consistently describe the transformed sound as reminiscent of higher-displacement machines, with one tester noting it "almost sounds like a Ducati." The AT2 system delivers a rich, throaty tone that enhances the riding experience without excessive volume.

Materials & Construction

• Yoshimura Works Finish stainless steel - Exclusive heat-reactive coating that develops unique coloration after first heat cycle
• Carbon fiber heel guard - Premium protection with race-inspired aesthetics
• Contemporary satin/matte finish - Modern appearance that complements the 450SS styling
• Increased fatigue strength - Superior durability compared to standard finishes
• Enhanced scratch and stain resistance - Maintains appearance with minimal maintenance

Fitment & Compatibility

Installation & Specifications

What's Included

• Yoshimura AT2 muffler assembly (Part #19450BP520-RMA)
• Exhaust clamp
• M8x40mm socket head cap bolt
• Countersink washer
• Complete installation instructions

Installation Requirements

Skill level: Intermediate - Basic mechanical aptitude required
Tools needed: 8mm socket, torque wrench, basic hand tools
Installation type: Bolt-on slip-on system - no cutting, welding, or ECU tuning required
Modification to emissions system: None - maintains all factory emissions controls

Common Questions

Is this exhaust street legal?

Yes, the Yoshimura AT2 Street Series exhaust is fully street legal in all 50 states. It's EPA compliant for tail-pipe emissions and marked with appropriate EPA noise labels. This is a "Qualified Manufacturer Declared Replacement Part" that does not require tampering with your CF Moto's emissions control system, making it legal for street use while delivering significant performance gains.

Will this fit my CF Moto 450SS or 450NK?

This exhaust fits 2023-2025 CF Moto 450SS sport bikes and 2024 CF Moto 450NK naked bikes. It's a direct bolt-on replacement for the stock exhaust with no modifications needed. Part number 19450BP520 is specifically engineered for the 449cc parallel twin engine used in both models.

Do I need a tune or ECU flash after installing this exhaust?

No tuning required. The Yoshimura AT2 is designed to work with your stock ECU mapping while delivering measurable performance gains. The 6.3% horsepower increase and 10% torque improvement are achieved without requiring any fuel system modifications or computer adjustments.

How much lighter is this compared to the stock exhaust?

The Yoshimura AT2 weighs nearly half what the stock CF Moto muffler weighs, resulting in significant unsprung weight reduction that improves handling characteristics and overall bike dynamics. This weight savings is immediately noticeable during aggressive cornering and direction changes.

What maintenance does this exhaust require?

Yoshimura recommends repacking the muffler at least once per year to maintain optimal sound and performance. The Works Finish stainless steel should be cleaned with mild soap and water—avoid abrasive cleaners or polishes. Wipe down with rubbing alcohol before first use to remove oils and fingerprints. The finish will naturally develop heat coloration (blues, purples, golds) which is normal and enhances the premium appearance.

Is the carbon fiber heat shield durable?

Yes, the carbon fiber heel guard is engineered for durability, but requires proper maintenance. Keep all mounting hardware tight as carbon fiber is susceptible to vibration damage. Avoid contact with chemicals or solvents. If you notice amber discoloration in the resin, discontinue use and have the system inspected—this indicates heat damage that needs attention.

What warranty does Yoshimura provide?

This exhaust includes Yoshimura's standard 1-year limited warranty against defects in workmanship and materials. The warranty covers manufacturing defects but does not cover damage from abuse, improper installation, modifications, or lack of maintenance. Yoshimura offers refurbishment services if needed, with 3-5 day turnaround plus transit time.

Why choose Yoshimura for my CF Moto 450SS?

Yoshimura is the first major aftermarket brand to engineer a complete exhaust system specifically for the CF Moto 450SS and 450NK. With over 60 years of racing heritage and exhaust development expertise, Yoshimura brings proven engineering to this emerging platform. The AT2 system delivers dyno-verified results that dramatically improve the riding experience—making the 450SS feel like the performance machine CF Moto intended it to be.

About the Works Finish

Yoshimura's exclusive Works Finish is a heat-reactive coating that transforms appearance after the first heat cycle. Similar to the titanium components used on Yoshimura's factory race bikes, this finish develops uniform, naturally occurring heat coloration in blues, purples, and gold tones. The contemporary satin/matte surface offers increased fatigue strength and superior scratch resistance compared to standard stainless finishes, while requiring minimal maintenance.

Why New CF Moto 450SS Owners Choose This Exhaust

The CF Moto 450SS and 450NK represent exceptional value in the sport bike market, but the stock exhaust significantly limits their performance potential. Yoshimura's extensive testing confirmed what riders suspected—the 449cc parallel twin "woke up" dramatically with proper exhaust flow. The result is a bike that sounds bigger, accelerates harder, and delivers the spirited performance that matches the 450SS's impressive fit and finish. For new CF Moto owners looking to unlock their bike's full potential while maintaining emissions compliance and warranty-safe modifications, the Yoshimura AT2 is the definitive choice.

Technical Resources

Part Number: 19450BP520
Installation Instructions: Download PDF Installation Guide
Torque Specifications: Muffler mount bolt to factory spec, exhaust clamp to 9.5 Nm (7 ft-lb)
Manufacturer: Yoshimura Research & Development of America, Inc.