RS-12 vs RS-4: Choosing Your Yoshimura Titanium Exhaust
By Yoshimura R&D of America, Inc. | Published: 2026-10-19
Category: Buying Guides
Compare the Yoshimura RS-12 and RS-4 titanium exhaust systems for dirt bikes. Learn which champion-proven design fits your riding style and budget.
Quick answer
Choose the RS-12 if you want the latest championship-winning technology for a Honda CRF450R. Pick the RS-4 if you ride a KTM 250 SX-F and want a proven, more affordable titanium system with a quiet tone.
Racing pedigree and design philosophy
The RS-12 and RS-4 represent different generations of Yoshimura titanium exhaust engineering. The RS-12 is the newest system, designed specifically for the 2021-2024 Honda CRF450R and its variants. It powered Chase Sexton to the 2023 450 Supercross title and Jett Lawrence to a perfect 2023 season. The RS-4, while older, has its own championship résumé in Supercross and Motocross and remains a current option for the KTM 250 SX-F.
Price and value differences
The RS-12 system for the Honda lists at $1,039.35 (compared to $1,599.00), reflecting its newer design and platform-specific R&D. The RS-4 for the KTM is priced at $339.32 (compared to $499.00), making it a more accessible upgrade. The price gap is substantial, but each system is engineered for a different bike and rider expectation.
RS-12 vs RS-4: Key tradeoffs
- Latest vs. proven technology: The RS-12 is Yoshimura's newest full-system design for the Honda CRF450R, while the RS-4 is a mature, well-refined platform for the KTM 250 SX-F. The RS-12 benefits from the most recent R&D, but the RS-4's Polyresonant chamber is a proven solution for power and sound control.
- Price vs. performance tier: At $1,039.35, the RS-12 is a premium investment for serious Honda racers. The RS-4 at $339.32 offers strong value for KTM riders who want a titanium system without the top-tier price tag. Your budget and bike model will largely decide which system makes sense.
- Sound signature and compliance: The RS-4 is specifically noted for its quiet exhaust tone thanks to the duplex chamber design. The RS-12's sound characteristics are not detailed in available specs, so riders concerned with noise regulations may want to investigate further. If sound level is a deciding factor, the RS-4 has a documented advantage.
Product facts at a glance
- CRF450R/RX 2021-2024 / CRF450R-S 2023-2024 RS-12 Titanium Full Exhaust, w/ Titanium Muffler: The RS-12 is the #1 exhaust in Supercross and Motocross, powering Chase Sexton to the 2023 450 Supercross title and Jett Lawrence to the 2023 450 Motocross and SMX title with a perfect season. If you ride a Honda CRF450R and want the same exhaust used by factory champions, the RS-12 is your direct path to that technology.
CRF450R/RX 2021-2024 / CRF450R-S 2023-2024 RS-12 Titanium Full Exhaust, w/ Titanium Muffler - KTM 250 SX-F 13-15 RS-4 Titanium Full Exhaust, w/ Titanium Muffler: The RS-4 features a Polyresonant duplex chamber design that provides an unrivaled combination of power and quiet exhaust tone, winning multiple Supercross and Motocross titles since its inception. Riders on a KTM 250 SX-F who prioritize a quieter exhaust without sacrificing race-proven performance will find the RS-4 a balanced choice.
KTM 250 SX-F 13-15 RS-4 Titanium Full Exhaust, w/ Titanium Muffler
Which exhaust fits your build?
Best for
- Honda CRF450R (2021-2024) or CRF450RX/CRF450R-S owners wanting the latest championship-winning exhaust
- Riders who prioritize top-tier racing technology and are comfortable with a higher investment
Not for
- KTM 250 SX-F owners (the RS-12 is not available for that model)
- Budget-conscious riders who don't need the newest generation of exhaust design
