The Yoshimura exhaust lines are developed in collaboration with the top US teams.
They trust them: Team Geiko, Team Rockstar Suzuki (Justin Barcia, Trey Canard, Eli Tomac, James Stewart).
The RS-4 is a complete aluminium/stainless steel exhaust with a pentagonal silencer and carbon end cap.
Designed with a "duplex poly-resonant chamber," making it quieter while increasing power across the entire usage range.
Supplied with a db killer to meet the FIM 2013 noise standards and a second db killer with spark arrestor.