After an impressive run of over two decades, 2025 brings an all-new Suzuki DR-Z4S/SM.

The new 398cc single cylinder water cooled engine is now fuel injected! We developed our RS-12 Race Series full system exhaust to enhance every aspect of the new DR-Z and the response was just what the doctor ordered. The RS-12 Race Series Full System packed substantial gains in performance adding 5.5% in hp @6,640rpm and 2.8% increase of torque @5,180rpm. These gains were made with our included/installed USFS spark arrestor SA-21-K! A custom stainless Yoshimura heat shield is included.

Yoshimura's RS-12 is proudly designed, developed and manufactured in Chino, California.

Weights:

Stock system: 17.8 lbs.

Yoshimura RS-12 full system: 10.6 lbs.

Sound levels:

(Using J2825 standards) with installed spark arrestor.

2000 rpm

Stock: 74.4dB

RS-12: 90.4 dB

5000 rpm

Stock: 84.4 dB

RS-12: 93.4 dB

FOR CLOSED COURSE COMPETITION ONLY; NOT INTENDED FOR STREET USE

The product that you are purchasing is designed and intended for closed course competition use only and is labeled as such, i.e. Yoshimura "RACE SERIES." Yoshimura RACE SERIES products are neither designed nor intended for use on PUBLIC ROADS or LAND. Such use is prohibited by Federal and State regulations.