Yoshimura Full System Honda Crf450R/Rx 2021-24 Rs-12 Ss Signature Series 225850S321

This new system has been developed with - and is the closest thing to what 5x World Champion Tim Gajser, Chase Sexton, Jett Lawrence have been using to grab holeshots and win championships. By increasing the resonator in the RS-12 muffler by 50cc (a 14% increase) and adding a second resonator to the header, our engineers were able to unlock some insane usable power from this new and improved system.

The new RS-12 system adds 5% max hp and 6.5% max torque to the new engine spec with its smaller throttle body and different ECU settings.

What does this translate to?

Easier power delivery

Smoother frontside torque

Allows the rider to ride in an higher gear, thus freeing up suspension.

Less rider fatigue

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