The dual-muffler configuration on the redesigned 2013
CRF450R gave us the opportunity to create an entirely new muffler,
specifically built for the CRF450R. We worked in secret with Top AMA Pro
Riders: Jeremy McGrath, Justin Barcia, Trey Canard, Eli Tomac, and
Justin Brayton, to achieve maximum performance, mass centralization, and
optimize rider-usability. We were able to achieve all this, while
keeping sound levels in check with AMA Regulation.
stock header flows seamlessly into our re-configured tail-pipe, where the
exhausts gases are separated to each muffler. Yoshimura's vertical
divider splits the exhaust gases more evenly compared to the stock horizontal divider, providing smoother flow which
improves mid to top power and throttle response.
exhausts gases then reach our new, dual RS-9 mufflers.
RS-9's parallelogram-shaped muffler body increases muffler volume over
the stock system, resulting in better throttle response and improved
noise cancellation. The dual setup enabled us to position the mufflers
closer to the bike's center of gravity (mass centralization) resulting
in better handling for the rider. An additional benefit of the mass
centralization process was decreasing potential for muffler damage in
the event of crash.
RS-9 not only makes more
power and torque possible, but does it more quietly than single systems.
The uniquely sculpted Carbon Fiber end-caps feature a Tunable Insert
System, able to fine-tune power delivery and decibel levels to rider
Slip-On System features Dual RS-9 Aluminum Sleeved
Mufflers with Carbon Fiber End-caps, Stainless Steel Tail-pipe,
installation hardware, and detail step-by-step instructions.