Yoshimura RS-4 Exhaust Review 2019-20 Suzuki RM-Z 250 

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Test editor Michael Lindsay evaluates the new RS-4 on the new Suzuki RM-Z250
2019 RM-Z 250 sees a new era and with the partnership of JGR Factory Suzuki Racing we were able to develop the very best option for the new RM-Z 250
For Yoshimura, the heart of performance and power is our RS-4 muffler with its Polyresonant Duplex front chamber, special baffle and added overall volume helps make the 2019 RM-Z250 come alive. Max peak horsepower is 9% while the max torque is a big 15.2%. All designed around making power that the new Zook puts out to be most efficient.
If you're serious - it's only Yoshimura. Proudly made in the USA!