The Honda CRF450R has always been known for its strong engine character: linear, responsive, and packed with usable power. However, we're always looking for improvements, and where better to look than the brand that even Honda HRC trusts? After logging a full day of testing and many laps with this system, here’s a full breakdown of how it complements and elevates the CRF450R platform.

Specifications and Details

• Hydroformed Muffler - This is the first of a new generation RS-12 profile exhaust system featuring weight-reducing hydroformed technology. This technology allows Yoshimura to maximize available space for a tailored fit while minimizing material usage. 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.
• Carbon Faced Machined Joint - A new carbon-faced machined joint no longer requires the use of anti-seize. This is accomplished by impregnating the surface of the stainless steel joint with carbon atoms. The result is a reduction in wear over the life of the joint by reducing friction.
• Inserts - The RS-12 for the 2025 Honda CRF450R/RX also comes with an INS-32-K sound insert installed. there are other optional inserts available as well.
• MSRP - $1,149.00

Build Quality & Installation

Right from the unboxing, the RS-12 impresses with a premium fit and finish. Compared to the stock system, it feels like a major step up in craftsmanship. The materials used—most notably the titanium header and stainless steel mid-pipe—not only reduce weight, but also ensure strength and longevity under heat and high RPM stress. Yoshimura clearly put serious thought into durability and race-level performance.

Installation was refreshingly simple. The kit comes complete with clearly written instructions and all the necessary hardware. I had it fully mounted and ready to ride in about 10 minutes. It even includes extras like an exhaust plug for washing and a spring puller tool, both of which are thoughtful additions that speak to Yoshimura’s rider-focused approach. Coming from someone who’s worked in-house on Yamaha bikes for the past eight years, this install was a breath of fresh air. The YZ’s engine design often makes full exhaust swaps a chore—whereas the RS-12 on the CRF450R was quick and frustration-free.

Performance & Power Delivery

Now to the good stuff—performance. This is where the RS-12 really shines and justifies its premium price tag. Throttle response is significantly sharper off the bottom, and low-end torque feels more immediate. It makes a real difference in how the bike pulls out of corners and through slower technical sections. I found myself confidently running third gear in places I’d normally need second, without sacrificing drive.

To see it in action and hear our test rider's thoughts, click play

The mid-range punch is where the RS-12 transforms the riding experience. Power delivery feels smoother yet more connected, giving you more usable torque right where it matters most on the track. It’s not a “hit” of power that surprises you—it’s a smooth, predictable build that helps maintain traction and momentum. Over the course of several motos, I noticed a consistent improvement in how planted the bike felt while cornering and especially while accelerating out of ruts or off cambers.

High RPM performance also saw noticeable gains. The bike is more free revving and carries power longer into high rpm, making it easier to stretch each gear without losing momentum. One thing I’ve always noticed about the CRF450R compared to, say, the YZ450F, is that it tends to vibrate more at higher revs. However, the RS-12 seemed to tame that character. The engine felt smoother, with less harshness in over-rev situations, allowing me to ride in a higher rpm more frequently without shifting.

Handling and Ride Feel

With the weight reduction from the exhaust system, the CRF450R’s already agile chassis becomes even more flickable. While it’s a subtle change, it’s noticeable, especially when transitioning quickly through chicanes or setting up for a tight corner after a long straight. The bike responds to rider input more immediately, giving it a lighter, more responsive feel in both the front and rear.

I also found that direction changes were quicker, and I had more control over line selection, particularly when making mid-corner adjustments. The RS-12 helps the bike feel better balanced, especially under braking or during hard acceleration, and the engine braking is better modulated. When you chop the throttle, the deceleration is more controlled, which means the front doesn’t dive unnecessarily, and you stay more composed entering turns.

Final Thoughts

One subtle thing to mention is the overall ride character. While the RS-12 gives the CRF450R a more refined power delivery, some riders might find that it takes away a bit of that raw, punchy “wow” factor that the stock exhaust sometimes offers. However, in return, you get better throttle control, improved traction, and more rideable power throughout the rev range. For racers or serious riders looking for lap-time improvements and consistency, this trade-off is more than worth it.

After a full day on the 2025 CRF450R with the Yoshimura RS-12 system, I can confidently say this is more than just an aftermarket add-on—it’s a performance enhancer in the truest sense. It doesn’t just make the bike faster; it makes it easier to ride faster. The RS-12 improves throttle response, torque, weight distribution, and overall handling feel. Whether you're a weekend warrior, an amateur racer, or even someone prepping for pro-level competition, this exhaust is an outstanding upgrade.

If you're looking to extract more from your 2025 CRF450R without compromising reliability or build quality, the Yoshimura RS-12 is one of the best investments you can make for real-world performance and feel.