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EXHAUST
TIRES
TUBES
TIRE
ACCESSORIES
BIKE
ACCESSORIES
SNOW BIKE
PIT BIKE
GRAPHICS / SEAT
BODY
CONTROLS
BARS / GRIPS
LEVERS
CABLES
INTAKE
FUEL SYSTEMS
AIR FILTERS
OIL FILTERS
ELECTRICAL
SPARK PLUGS
BATTERIES
CHARGERS
ENGINE
PISTONS
SUSPENSION
DRIVE
CHAIN
SPROCKETS
BRAKES
CHEMICALS
GAS CANS
TOOLS
LOCKS
RAMPS / STRAPS
TRAILERS
PROMOTIONAL
REFERENCE
INDEX
50
EXHAUST
Building performance exhaust systems for the factory race efforts improves our research and development, which
improves the overall performance of our products. Adapting technology we learn on the track to our consumer prod-
ucts is what makes the Yoshimura name synonymous with quality and performance. One look at our RS-9 and RS-4
exhaust systems illustrates the endless cycle of development. Working in conjunction with the factory teams has pro-
vided us with new ways to increase performance, lower sound levels and centralize mass. The end result is a product
that gives you an unparalleled competitive advantage.
RS9 DUAL TAPERED
• Dyno and track tested by Honda R&D in Japan,
American Honda MX Team, and HRC All Japan MX
Racing Team
• 3-stage header provides broader overall range of power
and throttle response.
• New tail pipe divider creates smoother exhaust flow and
better velocity to the right and left tail pipe
• New compact forward positioned RS-9T dual muffler
design provides lower center of gravity for better mass
centralization
• Larger RS-9T core creates improved throttle response,
and power in mid and top end
• New RS-9T mufflers have more volume than stock to
provide a decrease in overall dB noise level
RS9 DUAL
• Parallelogram-shape muffler
• Maximized internal volume
• Straight, single core baffle
• Tunable insert system
• Spark Arrestor/Sound Insert Compatible
RS4
• Pentagonal-shaped muffler
• Maximized internal volume
• Polyresonant duplex front chamber
• Stepped, two-stage core baffle
• Spark Arrestor/Sound Insert Compatible
RS3
• Oval-shape muffler
• Maximized internal volume
• Straight, single core baffle
• Spark Arrestor / Sound Insert Compatible
RS2
• Diamond-shape muffler
• Maximized internal volume
• Straight, single core baffle
• Spark Arrestor / Sound Insert Compatible
Continued on the next page
EXHAUST