YOSHIMURA RS-4 SIGNATURE EXHAUST SYSTEMS AND SLIP-ON MUFFLERS EXHAUST RS4 TI/CF YZ450F

MFPN:234801D220

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Every Yoshimura exhaust product is made by hand to the highest quality standards

Championship-winning racetrack experience and Yoshimura's extensive R&D facility ensure these pipes perform

This dedication to research and development is only matched by Yoshimura's dedication to uncompromising quality standards

True performance art for your motorcycle

All Signature series exhaust are tested, documented and marked with appropriate EPA noise emissions labels

Do not require changing the motorcycle's emissions control systems

CARB and EPA emissions "Replacement Parts"

Certified by independent laboratory for EPA noise levels

Deliver performance in a slip-on/bolt-on muffler package

Do not require changing the motorcycle's emissions control systems

Marked with appropriate EPA noise emissions labels

CARB and EPA emissions "Replacement Parts"

Not tested for EPA noise levels

Designed for closed-course competition use only; not for street use

Meet noise level regulations of most worldwide race sanctioning organizations

Marked with appropriate EPA noise emissions labels

Not tested for EPA noise levels

An evolution of Yoshimura’s off-road exhaust system

Equipped with USFS-approved spark arrestors, forest-friendly noise levels and are tailpipeemissions compliant

Marked with appropriate EPA noise emissions labels

Not tested for EPA noise levels

Delivers huge power at a very light weight

Offers better handling thanks to a lower centralized mass coefficient

Uniquely-styled pentagonal muffler body with a carbon fiber cone end cap

Front cap design functions as a polyresonant chamber to lower dB output while improving mid- to top-end power

Two-staged, stepped baffle

Tapered headpipe delivers optimal flow and performance

Titanium systems include non-spark-arrested 99 dB motocross insert (unless noted)

Mufflers available with glossy carbon fiber, satin titanium or brushed aluminum sleeve

Stainless systems come with 94 dB insert installed (meets AMA competition requirements), 2 meter Max insert in the box